Hi Rich,
Taking a look at your output, my brain said "good question", ha.
Usually the key line to look for is the "AUTHORITY:" line, which yours
lacks.
So the usual next step is to start searching on https://epsg.io for the
text "UTM zone 10N".
But more recently the official EPSG homepage includes a search tool that
does a live search on its own database (giving guaranteed
accurate/uptodate responses):
- goto https://epsg.org
- click the top menu: EPSG Dataset/Text Search
- enter: UTM zone 10N and press "Go"
- gives a response of 12 items
EPSG:26910 does look somewhat similar :)
Hope that gives you some hints... (at least on the official EPSG code
perspective)
-jeff
--
Jeff McKenna
GatewayGeo: Developers of MS4W, MapServer Consulting and Training
co-founder of FOSS4G
http://gatewaygeo.com/
On 2021-09-22 7:49 p.m., Rich Shepard wrote:
Applying gdalsrsinfo to a shapefile's .prj produced these results:
PROJ.4 : +proj=utm +zone=10 +datum=NAD83 +units=m +vunits=m +no_defs
OGC WKT2:2018 :
COMPOUNDCRS["NAD83 / UTM zone 10N + NAVD88 height",
PROJCRS["NAD83 / UTM zone 10N",
BASEGEOGCRS["NAD83",
DATUM["North American Datum 1983",
ELLIPSOID["GRS 1980",6378137,298.257222101,
LENGTHUNIT["metre",1]],
ID["EPSG",6269]],
PRIMEM["Greenwich",0,
ANGLEUNIT["Degree",0.0174532925199433]]],
CONVERSION["UTM zone 10N",
METHOD["Transverse Mercator",
ID["EPSG",9807]],
PARAMETER["Latitude of natural origin",0,
ANGLEUNIT["Degree",0.0174532925199433],
ID["EPSG",8801]],
PARAMETER["Longitude of natural origin",-123,
ANGLEUNIT["Degree",0.0174532925199433],
ID["EPSG",8802]],
PARAMETER["Scale factor at natural origin",0.9996,
SCALEUNIT["unity",1],
ID["EPSG",8805]],
PARAMETER["False easting",500000,
LENGTHUNIT["metre",1],
ID["EPSG",8806]],
PARAMETER["False northing",0,
LENGTHUNIT["metre",1],
ID["EPSG",8807]],
ID["EPSG",16010]],
CS[Cartesian,2],
AXIS["(E)",east,
ORDER[1],
LENGTHUNIT["metre",1,
ID["EPSG",9001]]],
AXIS["(N)",north,
ORDER[2],
LENGTHUNIT["metre",1,
ID["EPSG",9001]]]],
VERTCRS["NAVD88 height",
VDATUM["North American Vertical Datum 1988"],
CS[vertical,1],
AXIS["gravity-related height (H)",up,
LENGTHUNIT["metre",1,
ID["EPSG",9001]]]]]
The data are the Columbia River and southern Washington state.
It's been a couple of decades since I last dug into proj and I'd appreciate
being pointed to a document that will teach me which of the several EPSG
codes above is the one to which I want to apply to PROJ_INFO in the
PERMANENT mapset.
TIA,
Rich
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