Category: Course Student Work

This week I explored the Delaware County Ohio GIS Data Hub and reviewed the available datasets under the “All Files” section. After reading through the data summaries, I downloaded the Parcel, Street Centerline, Hydrology, and Township Boundary shapefiles. I extracted the files and added them into ArcGIS Pro so I could look through the attribute tables and better understand what information is attached to each layer.

The Parcel layer is the most detailed dataset. It includes property boundaries across Delaware County and contains a large amount of attribute information, such as parcel identification numbers, ownership details, and land use classifications listed in the “class” field. This dataset will be especially useful for spatial selection and land-based analysis.

The Street Centerline layer shows the county’s road network, including road names and classifications. This will help provide reference on maps and will also be useful for buffering and proximity analysis.

The Hydrology layer includes streams and other water features throughout the county, which will support environmental and spatial relationship analysis. The Township Boundary layer defines township limits and will allow me to focus analysis within a specific administrative area.

For my final project, I plan to focus on Concept 3 (“What’s Inside?”) and Concept 4 (“What’s Nearby?”). These concepts will allow me to examine how parcels relate to township boundaries and water features, as well as analyze proximity to roads and streams using buffers. Overall, these datasets provide a strong foundation for meaningful spatial analysis in Delaware County.

Zip Code: This dataset contains all existing zip codes, covering different outlines of land, for Delaware county. It references a collection of data found on Census Bureau, the United States Postal Service, and tax mailing addresses. 

School Districts: A visual compellation of different school districts throughout Delaware county. Information on this dataset is updated regularly, sourced from Delaware County Auditor’s parcel records. 

Building Outlines 2023: This is a dataset that contains blocked out outlines for each building located within Delaware County up to the year 2023. 

Building Outlines 2021: This dataset contains blocked out outlines for buildings existing within Delaware county in the year 2021. 

PLSS: This dataset visually displays the Public Land Survey System, with the polygons representing data from the U.S military and Virginia military survey districts. The creation of this dataset aided in identifying the boundaries of the prior mentioned survey land. The data is updated when needed. 

Township: The data includes 19 townships that reside within Delaware county. In order to keep the information up to date, the data is updated when needed. 

2024 Aerial imagery: imagery captured in 2024 of Delaware county. 

Delaware County E911 Data: This dataset represents the different location based response system locations in place within Delaware county. Each address data-point is a different emergency response location. The information provided is intended to aid emergency responders in the closest response site from particular surrounding addresses. This information is updated daily. 

Original Township: A dataset that displays the state of Delaware’s townships before tax districts changed their shape. 

2021 Imagery (SID file): Imagery captured in Delaware County in 2021. 

Recorded Document: This is a dataset that is composed of points that indicate locations with recorded documents such as Plat’s books, slides, and instrument records. The records themselves consist of various surveys regarding different features within Delaware. The purpose of this dataset is to aid in the locating of different types of documents. 

Dedicated Row: The features that this dataset represents are the different lines that are designated the right of way within Delaware County. This information was created through daily updates. The changes made are sourced from Delaware county’s recorder office.

Precincts: The data from this set is in relation to differentiated voting precincts. The information is regulated by the Delaware county board of education. It is updated on a regular basis to keep the information up to date. 

Delaware County Contours: A datafile of the different elevation contours of the landscape of Delaware county as of 2018. The data is in Geodatabase format. 

Building Outlines DXF: An outline of buildings residing within Delaware. 

Street Centerlines DXF: Contains data that indicates the centerline of pavement in both public and private roads running through Delaware county. The dataset was created using building permit information.

Address Points DXF: This specific dataset includes information about location based addresses to increase accuracy. The information in this dataset was created by the state of Ohio and Delaware County, and is maintained using the Delaware County Auditors GIS office. 

Parcel: The dataset contains polygon information that outlines the parcels within Delaware county. Any changes within the dataset are done in reference to recorded documents, and information is maintained by Auditors CAMA. 

Street Centerline: Outlines are made that indicate the centerline of public and private roads within Delaware. The information is collected from field observations and existing addresses. 

Condo: A dataset that contains polygons that indicate the location of existing condos within Delaware County. The polygons have been sourced from Delaware County’s recorders office. 

Subdivision: This Data file contains a combination of both subdivisions and condominiums within Delaware County. The data is updated regularly in order to maintain accuracy. 

Address Point: This data file contains geographically accurate addresses for Delaware County. The information is upheld by the Delaware County Auditor’s office. This data is intended to support emergency first responders as well as other services that require geographic understanding. 

Map Sheet: This file contains all map sheets depicting Delaware County. 

Farm Lot: The datafile displays existing farmlots within Delaware County. The data is in correlation to both U.S military and Virginia military survey zones. This dataset was created to clarify the borders of the county’s farmland and military districts. 

Annexation: This file displays Delaware County’s annexations on a time frame from 1853 and up to present day. This data is updated when needed, particularly when annexations are recorded. 

Survey: This dataset contains dot style data features that represent different surveys of land across Delaware County. The displayed information is sourced from the Recorder’s Office. All of the surveys residing in the Recorder’s Office since 2004 are collected by GIS scanners. 

Tax District: This file displays all tax districts within Delaware. The information is described by Delaware County’s Auditor’s real-estate office. It is updated when needed. 

2022 Leaf-On Industry: Imagery taken of Delaware county from 2022 in high resolution. 

Hydrology: This dataset displays major waterways that exist within Delaware County. This information is updated when needed. 

GPS: This information depicts all GPS monuments that had been recorded between the years 1991 and 1997. This data is updated when it is deemed necessary.

 

This section of the data was easy upon learning about the add Data section. I had even took the time to modify the colors of the map to my personal liking.

Address Point: A representation of all certified addresses that are in Delaware Ohio. Address points indicate the location of the building centroid and are indicated to support appraisal mapping, 911 emergency response, accident reporting, geocoding, and disaster management. It is also able to help 911 service agencies by giving information. It’s updated on a daily basis and published monthly. 

Annexation: Delaware County’s annexations and conforming boundaries from 1853 to today. It’s updated on an as needed basis after an annexation has been recorded by that Delaware County Records office, published monthly. 

Building Outline: outlines for all of the structures in Delaware County, Ohio. updated in 2024 and changes on an as-needed basis.

Condo: All of the condominium polygons that are within Delaware County, Ohio that have been reported to the Delaware County Records office.

Delaware County E911 Data: spatially accurate representation of all certified addresses that are within Delaware County Ohio, maintained by Delaware County Auditor’s GIS Office. Same information as the Address Point.

GPS: identifies all GPS monuments that were established in 1991 and 1997, it is updated on an as-needed basis and published monthly. 

MSAG: Polygon feature set of the 28 different political jurisdictions like townships, cities, and villages that make up Delaware County. This dataset is updated on an as-needed basis and is published monthly. 

Municipality: A data set containing all of the municipalities in Delaware County, Ohio 

Parcel: A data set of polygons representing all of the cadastral parcel lines that are within Delaware County Ohio, maintained by the Delaware County Auditor’s GIS office. Changes are represented by recorded documents that are stored within the Delaware County Recorder’s office. This is maintained by the auditor’s CAMA and is maintained on a  daily basis and is published monthly. 

Precincts: A dataset that consists of voting Precincts in Delaware County, Ohio. It is maintained by the Delaware County Auditors GIS Office under the direction of the Delaware County Board of Elections, this dataset is updated on an as needed basis and is published by the Delaware Board of Elections. 

Recorded Documents: Database showing points representing recorded documents in the Delaware County Recorder’s Plat books, cabinet/slides, and instrument records that aren’t represented by subdivision plats that are active. This was created to facilitate the process of locating miscellaneous documents that are within Delaware County, Ohio related to the cadastral land base. It is updated on a weekly basis, and published monthly. 

School District: Dataset with all of the Schools Districts within Delaware County Ohio. It is updated on an as needed basis, and published monthly. 

Street Centerline: pavement of public and private roads within Delaware County, A spatially accurate topologically correct representation of the road system. It is updated on a daily basis for all fields but the 3-D fields (updated on an annual basis).

Subdivision: A dataset that consists of all of the subdivisions and condos recorded in the Delaware County Recorder’s Office, Updated on a daily basis and published monthly. 

Survey: surveys recorded in the Recorder’s office and all surveys that are municipal/village jurisdictions that are residing in the offices as of May 2024, they were and still are being scanned by the Map Department. The Dataset is updated on a daily basis and it is published monthly. 

Tax District: data sets for all of the tax districts within Delaware County, Ohio. The data is defined by the Delaware County Auditor’s Real Estate Office and the Data is dissolved on the Tax District code, with the data being updated on an as needed basis, and published monthly. 

 

Chapter 7 

So far this chapter has been really interesting, and I quite enjoyed learning how to adjust the shapes around the buildings on the campus in several different ways, from just moving them to properly cover the building, to learning how to rotate and change the entire shape of them. Additionally, learning how to separate the shapes covering the buildings from one another, I think the split tool for me was the most confusing part of 7-1 because of how you had to click things in such specific spots. 

There were a couple of hiccups for the 7-2 section for me, but ultimately, this part of the chapter just felt like I was moving around a bunch of shapes and changing them, so it was pretty fun. I was also glad to learn how to separate the shapes that were on the top of the building because I had tried to adjust some of them in the first section, and it hadn’t shown us how to do that till later on.  I liked learning how to add the bus stops to this section, even though it was quite confusing, but it was interesting to add information like this to the map. 

As for 7-3 and 7-4, they felt quite short in comparison to the other sections, but they were interesting. Again, most of this chapter wasn’t too complicated, and I got through it fairly quickly in comparison to the rest of the chapters we’ve done so far. 

The smooth polygon feature was really easy to use, as are most of the features in geoprocessing, so this was interesting as well. 

Rotating and moving a shape to connect it with another one was kind of confusing to do, but overall, not too bad. 

 

Chapter 8 

While working on the chapters, I’ve seen the create locator feature, but don’t remember using it at any point until now, so it was interesting to use that feature, considering a big component of the process is using zip codes to, I guess, ‘geocode’ the information onto the map. It was also interesting to see how, after doing this, there were a few records that didn’t match, but since they still had an address, it was still viable information. 

This chapter felt quite a bit shorter than the rest of the chapters, and I did not really struggle with any of it or have any particular questions about this chapter specifically. 

Chapter 9 

Something I did really struggle with a few chapters ago was trying to use the select by attributes tool, but I have had to use it a couple of times in this chapter, and it has gotten quite a bit easier to understand how to do, and with practice, I understand how to do it now without struggling. 

Working with the service area and location-allocation tools has been confusing. Both 9-3 and 9-4 are complicated due to the many details. As I continued to finish 9-4, those tools became a lot easier to use, so I don’t have any concerns or questions about them. 

Another thing I really struggled with was trying to do the summary statistics for Hierarchy, ArrAge, and ArrGender. Since this was one of the your turn sections in the chapter and I wasn’t exactly sure what I was doing, it caused me a lot of confusion while i wass trying to work on it although I do think it was kind of fun to see the map throughout post of this seectiosn because I think the things being added in made them look really interesting. 

Here is the link to my final : https://docs.google.com/document/d/1HiRza6zAIbqoI9aU0jUt1iGJn3VzasIoQMQPOjH3NIE/edit?usp=sharing

 

 

listing and defining all 28 data analytics. Almost all of these data sets are updated regularly/daily and published monthly.

1. Zip Code – Contains all zip codes in Delaware County. Cleaned up in 2003, and in 2005, Delaware County dissolved parcels by their property address. Also used to populate the zip right and left attributes into road centerlines.
2. Tax district: This data is all the tax districts in Delaware County, Ohio. The data is defined by the Delaware County Auditor’s Real Estate Office, is dissolved on the Tax district code, and is updated as needed and published monthly.
3. Parcel – This map consists of polygons representing all cadastral parcel lines in Delaware county. Includes cadastral data that shows land ownership information. Indivudal data is maintained by the Auditor’s CAMA. This dataset is maintained daily and updated monthly.
4. Address Point – Maintained by Delaware’s Auditor GIS office, it is a spatially accurate representation of all certified addresses within Delaware County. Provides 911 services with address information and is updated daily and published monthly.
5. Recorded Document – Contains points representing recorded documents in the Delaware County Recorder’s Plat Books, Cabinet/Slides, and Instrument Records. It was created to facilitate the process of finding random or uncategorized documents by relating to the cadastral landbase.
6. School District– Contains all school districts in Delaware County. Created by the Delaware County Auditor’s records of the school districts. Published monthly.
7. Map Sheet- Contains all map sheets within Delaware County.
8. PLSS- Contains all of the Public Land Survey System polygons to be used by the U.S. military and the Virginia Military Survey Districts of Delaware County.
9. MSAG- Master Street Address Guide, contains all 28 different political jurisdictions in Delaware County. Was made to locate the boundaries of the cities, villages, and townships of Delaware County.
10. Municipalities- Contains all municipalities in Delaware County.
11. Farm Lot- Data of all farm lots in the U.S. military and Virginia Military Survey Districts of Delaware County. Made to identify all farm lots and their boundaries in Delaware County.
12. Township- Data of all 19 townships that make up Delaware County, Ohio. Updated as needed and published monthly.
13. Street Centerline-  The LBRS or State of Ohio Location Based Response System is a spatially accurate topolically represnation of the road system. Depicts center of paved public and private roads in Delaware County.  Used to assist in appraisal mapping, 911 response, accident reports, geocoding, etc. Standard layer updated daily, 3-D layer annually.
14. Annexation-  Data on Delaware County land annexations and boundaries from 1853 to the present. Updated as needed when an annexation is made and published monthly.
15. Condo-  Data of all condominiums in Delaware County that have been recorded with the Delaware County Recorder’s Office.
16. Subdivision-  Consists of all subdivisions and condos recorded in the Delaware County Recorder’s Office. Updated as needed and published monthly.
17. Survey- Contains points representing the land surveys within Delaware County. Updated daily and published monthly.
18. Dedicated ROW- Data set of all lines that are designated Right-of-Way within Delaware County. The data was created using parcel data. All its changes are represented by recorded documents in the Delaware County Recorder’s Office.
19. Building Outline 2024-  Outlines of buildings as of 2024.
20. Building Outline 2023- Outlines of buildings as of 2023.
21. Railroads- Displays all locations of railroads in Delaware County.
22. Precincts- All voting precincts in Delaware County. The dataset is maintained by the County’s GIS Auditor’s Office, with the direction of the Board of Elections. Updated and published by the Board of Elections, as needed.
23. Delaware County GIS Data Extract Web Map- Web map that allows for Delaware County GIS data to be extracted in various formats.
24. Delaware County E911 Data-  Used by LBRS. Data set is accurate to all certified addresses within Delaware, Ohio. 911 emergency response location data. Intended to provide 911 agencies with information for Phase II 911 requirements.
25.  Building Outline 2021-  Building outlines of all structures in Delaware County, Ohio last updated in 2021.
26. Hydrology- All major waterways in Delaware County. Data was enhanced in 2018 with LIDAR data, updated as needed and published monthly.
27. GPS-  All GPS monuments established in 1991 and 1997.
28. Delaware County Contours-  Map of Delaware County containing two-foot contour data, from 2018.
29. Original Township-  A dataset of the original boundaries of the townships of Delaware County prior to a shape change caused by tax district shifts.

The map gave me a little trouble at first because I forgot when extractinng my files to press the “Add Folder” button. I figured it out though. I recolored the map from its default and played with some of the features before uploading.

I also plan for my final to be on 1-Selecting and Classifying Land Uses and and 5- Mapping change.

 

 

Delaware Data Hub

 

This week I downloaded the necessary data for the final. I downloaded the parcel, street centerline,and hydrology files to my new folder. I opened the data sets into ArcGIS Pro and created a layer for each imported data set. I am going to do Concept 3 “What’s Inside” to determine what land parcels fall in floodplains. I am also going to do Concept 5, “Mapping Change” to determine how suburbs spread outward. I have attached the initial map, before I messed with it at all. 

ZIP Code: This data set contains all zip codes within Delaware County, Ohio. In 2003, Delaware County zip codes were carefully evaluated and cleaned-up based on cross referencing between the Census Bureau’s zip code file from the 2000 census, the United States Postal Service website, and tax mailing addresses from the treasurer’s office.

Building Outline 2023: Contains all outlines of every building in Delaware as of 2023 regardless of category or type.

Recorded Document: This dataset consists of points that represent recorded documents in the Delaware County Recorder’s Plat Books, Cabinet/Slides and Instruments Records which are not represented by subdivision plats that are active. They are documents such as; vacations, subdivisions, centerline surveys, surveys, annexations, and miscellaneous documents within Delaware County, Ohio.

Address Points: The State of Ohio Location Based Response System (LBRS) Address Points data provides for a spatially accurate placement of addresses within a given parcel in Delaware County. The data was created through a partnership between the State of Ohio and Delaware County. The data is maintained by the Delaware County Auditor’s GIS Office.

Street Centerline: The State of Ohio Location Based Response System (LBRS) Street_Centerlines depict the center of pavement of public and private roads within Delaware County. Address Range data was developed from data collected by field observation of existing address locations and by adding addresses using building permit information.

Parcel: This dataset consists of polygons that represent all cadastral parcel lines within Delaware County, Ohio. The cadastral geometries are maintained by the Delaware County Auditor’s GIS Office. All changes to this dataset are represented by recorded documents stored within the Delaware County Recorder’s Office.

Hydrology: This dataset consists of all major waterways within Delaware County, Ohio. This data was enhanced in 2018 with LIDAR based data. This dataset is updated on an as-needed basis and is published monthly.

GPS: This dataset identifies all GPS monuments that were established in 1991 and 1997. This dataset is updated on an as-needed basis, and is published monthly.

Condo: This data set consists of all condominium polygons within Delaware County, Ohio that have been recorded with the Delaware County Recorders Office.

 

• PLSS: (Public Land Survey System) created to help identify PLSS boundaries in US Military and Virginia Military Survey Districts of Delaware County
• Township: Consists of the 19 townships that make up Delaware County
• 2024 Aerial Imagery: 3in aerial imagery of Delaware County from 2024
• Delaware County E911 Data: Consists of spatially accurate representation of all certified addresses within Delaware County with a point placed at the center of each address. This can be used by emergency services and appraisal mapping by sending in the coordinates of the address.
• Building Outline 2021: Satellite view showing outlines of Delaware County buildings from 2021
• Original Township: Original boundaries of Delaware townships before tax districts changed their shapes
• Zip Code: Consists of all zip codes in Delaware County as shown by the Census Bureau’s zip code file from the 2000 census, the United States Postal Service website, and tax mailing addresses from the treasurer’s office. Tax exempt parcels and dedicated roads without zip codes were positioned based on their location.
• School District: Consists of all school districts in Delaware county from Delaware County Auditor’s parcel records of the school districts.
• Building Outline 2023: Satellite view showing outlines of Delaware County buildings from 2023
• 2021 Imagery (SID File): 2021 Aerial Imagery of Delaware County
• Recorded Document: Points relating to recorded documents such as vacations, subdivisions, centerline surveys, surveys, annexations, and miscellaneous documents within Delaware County to more easily locate miscellaneous documents.
• Dedicated ROW: Line data that consists of all dedicated Right-of-Way within Delaware County
• Precincts: Consists of Voting Precincts in Delaware County and maintained by the Delaware County Auditor’s GIS Office.
• Delaware County Contours: 2 foot contours of Delaware County in File Geodatabase format.
• Building Outlines – DXF: Satellite view showing outlines of Delaware County buildings
• Address Points – DXF: Depicts spatially accurate placement of addresses within Delaware County. From the State of Ohio Location Based Response System. Points are placed at approximately the center of the building, and is intended for use for emergency services and appraisal mapping.
• Street Centerlines – DXF: Depicts the center of pavement of public and private roads within Delaware County. From the State of Ohio Location Based Response System. Address Range data taken from field observation and building permit information.
• Parcel: Consists of polygons that represent all cadastral parcel lines within Delaware County
• Street Centerline: Consists of spatially accurate topologically correct representation of the road system and center of pavement of public and private roads within Delaware County from the State of Ohio Location Based Response System. Address Range data taken from field observation and building permit information for use in emergency services.
• Condo: Consists of all condo polygons from the Delaware County Recorder’s Office.
• Subdivision: Consists of all subdivisions and condos from the Delaware County Recorder’s Office.
• Tax District: Contains all tax districts within Delaware County as defined by the Delaware County Auditor’s Real Estate Office.
• Address Point: Depicts spatially accurate placement of addresses within Delaware County. From the State of Ohio Location Based Response System. Points are placed at approximately the center of the building, and is intended for use for emergency services and appraisal mapping.
• Map Sheet: Consists of all map sheets within Delaware County
• Farm Lot: Consists of all the farm lots in the US Military and Virginia Military Survey Districts of Delaware County.
• Annexation: Consists of Delaware County’s annexations and conforming boundaries from 1853 to now.
• Survey: Points placed on surveys of land in Delaware County, not containing old survey volumes 1-11.
• 2022 Leaf-On Imagery (SID File): 2022 Imagery 12in Resolution
• Hydrology: Consists of all major waterways within Delaware County and was enhanced in 2018 with LIDAR based data.
• GPS: Consists of all GPS monuments that were established in 1991 and 1997 within Delaware County.

• Zip Code – Delaware County’s zip code layer was created by cleaning and reconciling 2000 Census data, USPS records, and county tax mailing addresses, then dissolving parcels by their property addresses in 2005. It is maintained collaboratively with the USPS, updated as needed, and published monthly.
• School District – Delaware County’s school district layer was created from the county auditor’s parcel records identifying district boundaries. It is maintained on an as‑needed basis and released as part of the county’s monthly data publications.
• Building Outline 2023 – Delaware County’s 2023 building outline dataset maps every building footprint in the county, derived from updated parcel and spatial records. It is maintained and refined as needed to reflect new construction, demolition, and accuracy improvements.
• 2021 Imagery (SID File) – this provides high-resolution aerial photography of Delaware County in 2021. It serves as a countywide visual base map used for mapping, verification of land features, and comparison against other years of imagery to track development and landscape change.
• PLSS – The PLSS dataset maps all Public Land Survey System polygons in both the U.S. Military and Virginia Military Survey Districts of Delaware County. It is updated whenever new surveys are recorded and published monthly to keep boundary information current.
• Township – This data set consists of 19 different townships that make up Delaware County, Ohio. This dataset is updated on an as-needed basis and is published monthly.
• 2024 Aerial Imagery – The 2024 aerial imagery provides a countywide set of high‑resolution photos of Delaware County captured in 2024, offering an up‑to‑date visual snapshot of land use and development. It is maintained as needed and published monthly as part of the county’s standard imagery updates.
• Delaware County E911 Data – the dataset contains the geographic information used for emergency response, including address points, road centerlines, and related location data needed for accurate 911 dispatching. It is updated as needed to reflect new development and ensure responders have the most current location information.
• Building Outline 2021 – maps all building footprints in Delaware County as they existed in 2021, based on county parcel and spatial records. It provides a snapshot of development at that time and is maintained as needed to keep the outlines accurate.
• Original Township – shows the historic township boundaries that Delaware County had before later changes. It is kept up to date as needed so these early boundary lines remain accurate for reference.
• Recorded Document – contains all official land‑related documents filed with Delaware County, such as deeds, surveys, and other property records. It is updated whenever new documents are submitted so the county’s land records stay current.
• Dedicated ROW – refers to road right‑of‑way areas that have been officially set aside for public roads in Delaware County. This dataset maps those dedicated road corridors and is kept up to date as changes or new dedications occur.
• Precincts – the voting areas that divide Delaware County into smaller sections for managing elections and assigning polling locations. This dataset maps those precinct boundaries and is updated as needed to reflect any official changes.
• Delaware County Contours – show the elevation lines across the county, illustrating hills, slopes, and terrain shape. This dataset helps with mapping, planning, and understanding how the land rises and falls.
• The Building Outlines – DXF  – provides all building footprint shapes in Delaware County in a DXF file format for use in CAD and GIS software. It offers a clean, ready‑to‑use outline of every structure and is updated as needed to reflect new construction or changes.
• Address Points – DXF – contains all mapped address locations in Delaware County in a DXF format that can be used in CAD and GIS software. It provides precise point locations for homes, businesses, and other addressed sites, and is updated as needed to keep address information accurate.
• The Street Centerlines – DXF – shows all public roads in Delaware County as line features in a DXF format for use in CAD and GIS software. It provides an accurate map of the county’s road network and is updated as needed to reflect new or changed roads.
  
• The Parcels – It maps every property parcel in Delaware County, showing accurate boundary lines and ownership-related information. It is updated regularly to reflect new splits, combinations, and recorded changes in land records
• Street centerline – maps all public roads in Delaware County as single centerline paths, showing the official layout of the county’s road network. It is updated as needed to reflect new roads, realignments, or other changes.
• Condo – identifies condominium properties and their associated areas within Delaware County. It maps each condo unit as its own legal property, keeping the information current as new units are created or recorded.
• Subdivision – maps all officially recorded subdivisions in Delaware County, showing how larger parcels were split into lots and blocks. It is updated as new plats are filed so the county’s development patterns stay current.
• Tax District – shows the official tax boundaries used in Delaware County to determine which local authorities collect property taxes for each parcel. It is updated as needed so tax areas stay accurate when boundaries or jurisdictions change.
• Address Point – shows the exact mapped location of every assigned address in Delaware County, including homes, businesses, and other addressed sites. It is updated as needed to keep address information accurate for emergency response, mapping, and property records.
• Map Sheet – shows the grid of map sheet boundaries used by Delaware County to organize its official maps and GIS data. It provides a simple reference framework so users can locate features by sheet number.
• Farm Lot – shows the original agricultural lots that were surveyed and assigned when Delaware County was first laid out. These historic lot boundaries help trace early land division and are still used for reference in property research and mapping.
• Survey – It contains all officially recorded land surveys in Delaware County, including measured boundaries, bearings, and distances documented by licensed surveyors. It provides the legal, technical mapping of property lines and is updated whenever new surveys are filed or existing ones are corrected.
• 2022 Leaf‑On Imagery (SID File) – high‑resolution aerial photography of Delaware County taken during the growing season when trees have full leaves. It provides clear, detailed visuals for mapping, planning, and land analysis.
• Hydrology – Maps water related features like streams, rivers, ponds, lakes, and drainage systems. It shows how water  moves across the landscape.
• GPS – This dataset identifes all GPS monuments that were established in 1991 and 1997. This dataset updated on an as-needed basis, and is published monthly.