Geographic Information Systems Asked by programmer1234567 on September 3, 2021
I downloaded the data from here
https://geo-nsdi.er.usgs.gov/metadata/map-mf/2323/metadata.faq.html
When I loaded it into QGIS it says it has no CRS set. There is no .prj file.
After trying a variety of different CRSs I tried making my own custom CRS
The string I came up with is.
+proj=lcc +lon_0=-117.3819444 +lat_0=23.0 +datum=NAD27 +units=m +no_defs +ellps=clrk66 +a=6378206.4 +lat_1=33.0
This is my first time trying to make a custom projection.
The data is put in Canada north of where it should be.
It should be in the Great Basin in the USA mostly in Nevada.
Here is the pertinent information I used to guess at the string.
Any ideas on what I can change to have it placed in the correct place?
What coordinate system is used to represent geographic features?
The map projection used is Lambert Conformal Conic.
Projection parameters:
Standard_Parallel: 33.0
Standard_Parallel: 45.0
Longitude_of_Central_Meridian: -118.0
Latitude_of_Projection_Origin: 23.0
False_Easting: 0
False_Northing: 0
Planar coordinates are encoded using Coordinate pair
Abscissae (x-coordinates) are specified to the nearest 130.0
Ordinates (y-coordinates) are specified to the nearest 130.0
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: National Geodetic Vertical Datum of 1929
Altitude_Resolution: 30.0
Altitude_Distance_Units: meters
Altitude_Encoding_Method: Attribute values
My final string is below.
+proj=lcc +lon_0=-118.0 +lat_0=23.0 +datum=NAD27 +units=m +no_defs +ellps=clrk66 +a=6378206.4 +lat_1=33.0 +lat_2=45.0
Correct answer by programmer1234567 on September 3, 2021
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