Acquiring  GIS  Data: Utah

AGRC Quadrangle Codes:

In addition to the Ohio code naming convention AGRC also uses a grid code system for internal use and for data download.  A grid system for each corresponding scale has been created.  (1:24k, 1:100K, and 1:250k)  The 1:500k scales are statewide dataset.  

Results: ( agrc_grid_codes_24k )

Results: ( agrc_grid_codes_100k )

Results: ( agrc_grid_codes_250k )

Results: ( agrc_grid_codes_all )

The AGRC grid codes were created based on the tic ids.  Tic ids are points that represent each corner of a quadrangle.  The tic numbers were assigned starting in the NW corner of the state and for each 7-1/2’ to the right the number is incremented by 1 and for every 7-1/2’ down the number is incremented 100. 

Notice that for the 100k grid the numbers are incremented by 8 for the number of 7-1/2’ quadrangles to the right and by 400 for the number of 7-1/2’ quadrangles down.  Thus for the 100k grid numbering, the numbers start at 0303 in the NW corner of the state and the next grid to the right would be 0303 + 8 = 0311; the next grid down would be 0303 + 400 = 0703. 

As for the 250k the number would increase by 16 to the right and 8 going down.  Thus the next 250k quadrangle to the right would be 0303 + 16 = 0319 and the next quadrangle down would be 0303 + 800 = 1103. 

See the individual grid graphics above and take  few minutes noting the difference.

Questions:

Give the names of the surrounding quadrants of Q1919 at 1:24k

Give the names of the surrounding quadrants of Q1919 at 1:100k

Give the names of the surrounding quadrants of Q1919 at 1:250k

How many grids/quads make up the 30x60 block?

How many grids/quads make up the 1x2 degree block?

How many grids/quads make up the 7-1/2’ block?

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