{"id":7927,"date":"2026-10-11T21:56:01","date_gmt":"2026-10-12T02:56:01","guid":{"rendered":"https:\/\/sites.owu.edu\/geog-291\/?p=7927"},"modified":"2026-10-11T21:56:01","modified_gmt":"2026-10-12T02:56:01","slug":"jan-week-6","status":"publish","type":"post","link":"https:\/\/sites.owu.edu\/geog-291\/2026\/10\/11\/jan-week-6\/","title":{"rendered":"Jan Week 6"},"content":{"rendered":"<p dir=\"ltr\"><span style=\"text-decoration: underline\"><em><strong>Chapter 7: Digitizing<\/strong><\/em><\/span><\/p>\n<ul dir=\"ltr\">\n<li>Edited the Carnegie Mellon campus buildings by moving, rotating, adding vertices and splitting polygons so they lined up with the World Imagery basemap<\/li>\n<li>Made a new ParkingLots feature class and drew a parking lot polygon by tracing over the imagery<\/li>\n<li>The chapter also covered smoothing polygons and lining up CAD drawings with the real map<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-7928\" src=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261004-twfx-300x169.jpeg\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261004-twfx-300x169.jpeg 300w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261004-twfx-1024x576.jpeg 1024w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261004-twfx-768x432.jpeg 768w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261004-twfx-1536x864.jpeg 1536w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261004-twfx-2048x1152.jpeg 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p dir=\"ltr\">\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-7929\" src=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-bhyn-300x169.jpeg\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-bhyn-300x169.jpeg 300w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-bhyn-1024x576.jpeg 1024w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-bhyn-768x432.jpeg 768w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-bhyn-1536x864.jpeg 1536w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-bhyn-2048x1152.jpeg 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p dir=\"ltr\"><strong>Question:<\/strong> When you trace over a basemap, how accurate is it compared to GPS or LiDAR? Which would you trust for an official map?<\/p>\n<p dir=\"ltr\"><span style=\"text-decoration: underline\"><em><strong>Chapter 8: Geocoding<\/strong><\/em><\/span><\/p>\n<ul dir=\"ltr\">\n<li>Geocoding; turning addresses or ZIP codes from a table into points on a map<\/li>\n<li>Built a ZIP code locator and geocoded survey data from a Pittsburgh arts event. People came from PA, OH, MD and WV, but most were clustered around Pittsburgh<\/li>\n<li>Used Collect Events to combine attendees in the same ZIP into one point, so bigger circles equals more people (up to 118 in one ZIP)<\/li>\n<\/ul>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7930\" src=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-reqx-300x169.png\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-reqx-300x169.png 300w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-reqx-1024x576.png 1024w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-reqx-768x432.png 768w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-reqx-1536x864.png 1536w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-reqx-2048x1152.png 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7931\" src=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rfqg-300x169.png\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rfqg-300x169.png 300w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rfqg-1024x576.png 1024w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rfqg-768x432.png 768w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rfqg-1536x864.png 1536w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rfqg-2048x1152.png 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p dir=\"ltr\"><strong>Question:<\/strong> How accurate is ZIP code geocoding compared to street addresses, and when is ZIP level good enough?<\/p>\n<p dir=\"ltr\"><span style=\"text-decoration: underline\"><em><strong>Chapter 9: Spatial Analysis<\/strong><\/em><\/span><\/p>\n<ul dir=\"ltr\">\n<li>9-1: used Pairwise Buffer to draw half-mile zones around Pittsburgh\u2019s 32 public pools, then Select by Location to count kids (ages 5\u201317) close by. About 44.6% of kids live within a half mile of a pool<\/li>\n<li>I got ERROR 000210 the first time because the output wasn\u2019t saving to a geodatabase. Picking a proper output location fixed it<\/li>\n<li>9-2: Multiple Ring Buffer with 0.5 and 1 mile rings, so you can see who\u2019s close vs. a bit further<\/li>\n<li>Buffers are straight-line distance, which isn\u2019t perfect for Pittsburgh with all the rivers and hills. That\u2019s why the chapter moves to service areas on streets next<\/li>\n<\/ul>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7932\" src=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rhqn-300x169.png\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rhqn-300x169.png 300w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rhqn-1024x576.png 1024w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rhqn-768x432.png 768w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rhqn-1536x864.png 1536w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rhqn-2048x1152.png 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7933\" src=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rijw-300x169.png\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rijw-300x169.png 300w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rijw-1024x576.png 1024w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rijw-768x432.png 768w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rijw-1536x864.png 1536w, https:\/\/sites.owu.edu\/geog-291\/wp-content\/uploads\/sites\/208\/2026\/10\/SCR-20261005-rijw-2048x1152.png 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p dir=\"ltr\"><strong>Question:<\/strong> How much do service areas (real street distance) change the answer compared to simple buffers in a city like Pittsburgh?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chapter 7: Digitizing Edited the Carnegie Mellon campus buildings by moving, rotating, adding vertices and splitting polygons so they lined up with the World Imagery basemap Made a new ParkingLots feature class and drew a parking lot polygon by tracing over the imagery The chapter also covered smoothing polygons and lining up CAD drawings with the real map Question: When you trace over a basemap, how accurate is it compared to GPS or LiDAR? Which would you trust for an official map? Chapter 8: Geocoding Geocoding; turning addresses or ZIP codes from a table into points on a map Built a ZIP code locator and geocoded survey data from a Pittsburgh arts event. People came from PA, OH, MD and WV, but most were clustered around Pittsburgh Used Collect Events to combine attendees in the same ZIP into one point, so bigger circles equals more people (up to 118 in one ZIP) Question: How accurate is ZIP code geocoding compared to street addresses, and when is ZIP level good enough? Chapter 9: Spatial Analysis 9-1: used Pairwise Buffer to draw half-mile zones around Pittsburgh\u2019s 32 public pools, then Select by Location to count kids (ages 5\u201317) close by. About 44.6% of kids live within a half mile of a pool I got ERROR 000210 the first time because the output wasn\u2019t saving to a geodatabase. Picking a proper output location fixed it 9-2: Multiple Ring Buffer with 0.5 and 1 mile rings, so you can see who\u2019s close vs. a bit further Buffers are straight-line distance, which isn\u2019t perfect for Pittsburgh with all the rivers and hills. That\u2019s why the chapter moves to service areas on streets next Question: How much do service areas (real street distance) change the answer compared to simple buffers in a city like Pittsburgh?<\/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-7927","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\/7927","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=7927"}],"version-history":[{"count":1,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/posts\/7927\/revisions"}],"predecessor-version":[{"id":7934,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/posts\/7927\/revisions\/7934"}],"wp:attachment":[{"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/media?parent=7927"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/categories?post=7927"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.owu.edu\/geog-291\/wp-json\/wp\/v2\/tags?post=7927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}