{"id":7936,"date":"2026-10-11T22:02:37","date_gmt":"2026-10-12T03:02:37","guid":{"rendered":"https:\/\/sites.owu.edu\/geog-291\/?p=7936"},"modified":"2026-10-11T22:02:37","modified_gmt":"2026-10-12T03:02:37","slug":"jan-week-7","status":"publish","type":"post","link":"https:\/\/sites.owu.edu\/geog-291\/2026\/10\/11\/jan-week-7\/","title":{"rendered":"Jan Week 7"},"content":{"rendered":"<p dir=\"ltr\" style=\"text-align: center\"><span style=\"text-decoration: underline\"><em><strong>Delaware County GIS Data Inventory<\/strong><\/em><\/span><\/p>\n<p dir=\"ltr\">I went through the Delaware County GIS Data Hub and read about each layer. Here is what each one is.<\/p>\n<ul dir=\"ltr\">\n<li><strong>Parcel:<\/strong> Every property in the county as a shape. The table has the owner, acres, value, year built and a land use code.<\/li>\n<li><strong>Address Point:<\/strong> A point for every address. Mostly used for 911.<\/li>\n<li><strong>Street Centerline:<\/strong> A line down the middle of every road.<\/li>\n<li><strong>Building Outline 2021, 2023, 2024:<\/strong> The outline of every building from aerial photos. You can compare years to see new buildings.<\/li>\n<li><strong>Two Foot Contours:<\/strong> Lines that show elevation every 2 feet.<\/li>\n<li><strong>Hydrology:<\/strong> The main rivers, streams and lakes like Alum Creek and Hoover.<\/li>\n<li><strong>Zip Code:<\/strong> ZIP code areas.<\/li>\n<li><strong>Township:<\/strong> Township borders today.<\/li>\n<li><strong>Original Township:<\/strong> Township borders from when the county was first surveyed.<\/li>\n<li><strong>Municipality:<\/strong> City and village borders like Delaware, Powell and Sunbury.<\/li>\n<li><strong>MSAG:<\/strong> Areas 911 uses to know who should respond to an address.<\/li>\n<li><strong>School District:<\/strong> School district borders.<\/li>\n<li><strong>Tax District:<\/strong> Areas that pay the same tax rate.<\/li>\n<li><strong>Precincts:<\/strong> Voting areas.<\/li>\n<li><strong>Subdivision:<\/strong> Neighborhoods with their name, number of lots and the date they were made.<\/li>\n<li><strong>Condo:<\/strong> Condo buildings and complexes.<\/li>\n<li><strong>Annexation:<\/strong> Land that became part of a city or village over time, with dates.<\/li>\n<li><strong>PLSS:<\/strong> The old land survey grid used to split up land.<\/li>\n<li><strong>Farm Lot:<\/strong> Farm lot lines inside that survey grid.<\/li>\n<li><strong>Map Sheet:<\/strong> The grid for the county\u2019s tax map pages.<\/li>\n<li><strong>Recorded Document:<\/strong> Land records filed with the county, like surveys and annexations.<\/li>\n<li><strong>Dedicated ROW:<\/strong> Public right of way lines along roads.<\/li>\n<li><strong>Survey:<\/strong> Points where land surveys were done.<\/li>\n<li><strong>GPS:<\/strong> GPS markers set in 1991 and 1997.<\/li>\n<li><strong>Railroads:<\/strong> Train tracks in the county.<\/li>\n<li><strong>E911 Data:<\/strong> The full set of data 911 uses.<\/li>\n<li><strong>DXF files:<\/strong> CAD versions of the addresses, streets and buildings.<\/li>\n<\/ul>\n<p dir=\"ltr\"><strong>I choose to Map: Parcels, Streets and Hydrology<\/strong><\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7937\" src=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/Screenshot-2026-10-10-203603-300x169.png\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/Screenshot-2026-10-10-203603-300x169.png 300w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/Screenshot-2026-10-10-203603-1024x576.png 1024w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/Screenshot-2026-10-10-203603-768x432.png 768w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/Screenshot-2026-10-10-203603-1536x864.png 1536w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/Screenshot-2026-10-10-203603-2048x1152.png 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<ul dir=\"ltr\">\n<li>I downloaded Parcel, Street Centerline and Hydrology as shapefiles and added them to a new ArcGIS Pro project.<\/li>\n<li>There are 103,042 parcels. The south near Columbus is packed with small lots, and the north is mostly big farm parcels.<\/li>\n<li>Alum Creek and Hoover reservoirs really stand out, and a lot of roads and neighborhoods are built around them.<\/li>\n<\/ul>\n<p dir=\"ltr\"><strong>Question:<\/strong> Some layers come as both shapefiles and DXF files. Who uses the DXF versions? Is it mostly engineers and surveyors?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Delaware County GIS Data Inventory I went through the Delaware County GIS Data Hub and read about each layer. Here is what each one is. Parcel: Every property in the county as a shape. The table has the owner, acres, value, year built and a land use code. Address Point: A point for every address. Mostly used for 911. Street Centerline: A line down the middle of every road. Building Outline 2021, 2023, 2024: The outline of every building from aerial photos. You can compare years to see new buildings. Two Foot Contours: Lines that show elevation every 2 feet. Hydrology: The main rivers, streams and lakes like Alum Creek and Hoover. Zip Code: ZIP code areas. Township: Township borders today. Original Township: Township borders from when the county was first surveyed. Municipality: City and village borders like Delaware, Powell and Sunbury. MSAG: Areas 911 uses to know who should respond to an address. School District: School district borders. Tax District: Areas that pay the same tax rate. Precincts: Voting areas. Subdivision: Neighborhoods with their name, number of lots and the date they were made. Condo: Condo buildings and complexes. Annexation: Land that became part of a city or village over time, with dates. PLSS: The old land survey grid used to split up land. Farm Lot: Farm lot lines inside that survey grid. Map Sheet: The grid for the county\u2019s tax map pages. Recorded Document: Land records filed with the county, like surveys and annexations. Dedicated ROW: Public right of way lines along roads. Survey: Points where land surveys were done. GPS: GPS markers set in 1991 and 1997. Railroads: Train tracks in the county. E911 Data: The full set of data 911 uses. DXF files: CAD versions of the addresses, streets and buildings. I choose to Map: Parcels, Streets and Hydrology I downloaded Parcel, Street Centerline and Hydrology as shapefiles and added them to a new ArcGIS Pro project. There are 103,042 parcels. The south near Columbus is packed with small lots, and the north is mostly big farm parcels. Alum Creek and Hoover reservoirs really stand out, and a lot of roads and neighborhoods are built around them. Question: Some layers come as both shapefiles and DXF files. Who uses the DXF versions? Is it mostly engineers and surveyors?<\/p>\n","protected":false},"author":2362,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-7936","post","type-post","status-publish","format-standard","hentry","category-course-student-work"],"_links":{"self":[{"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/posts\/7936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/users\/2362"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/comments?post=7936"}],"version-history":[{"count":1,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/posts\/7936\/revisions"}],"predecessor-version":[{"id":7938,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/posts\/7936\/revisions\/7938"}],"wp:attachment":[{"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/media?parent=7936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/categories?post=7936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/tags?post=7936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}