Timeline for Calculate longest distance, in KM, between county centroids and their furthest point with PostGIS
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Mar 22, 2018 at 12:33 | comment | added | geozelot | @JeffErickson that's the one! | |
| Mar 22, 2018 at 12:20 | comment | added | Jeff Erickson |
Thank you. The output is Layer SRS WKT: GEOGCS["GCS_North_American_1983", DATUM["North_American_Datum_1983", SPHEROID["GRS_1980",6378137,298.257222101]], PRIMEM["Greenwich",0], UNIT["Degree",0.017453292519943295]]. Does this mean we are using EPSG:4269?
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| Mar 21, 2018 at 8:19 | comment | added | geozelot |
@JeffErickson nah, you can't just assume one ,) use ogrinfo <shapefile> gz_2010_us_050_00_500k -so to access the actual layers metadata.
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| Mar 20, 2018 at 21:58 | comment | added | Jeff Erickson |
Thank you, this is extremely helpful. Casting to geography type definitely provides a value that matches my estimate. When running ogrinfo on that shapefile, I get only 1: gz_2010_us_050_00_500k (Polygon). Is there a SRID that is accepted for use with the US as a whole? Or would one need to do it state-by-state, for example?
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| Mar 20, 2018 at 21:55 | vote | accept | Jeff Erickson | ||
| Mar 20, 2018 at 21:17 | history | edited | geozelot | CC BY-SA 3.0 |
added 90 characters in body
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| Mar 20, 2018 at 21:10 | history | edited | geozelot | CC BY-SA 3.0 |
added 60 characters in body
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| Mar 20, 2018 at 21:03 | history | answered | geozelot | CC BY-SA 3.0 |