(Last Updated 12/20/2015)

Topograhic Map Indexes


 

USA

USA Topo Index
 
 

Canada

Canada Topo Index
 
 
 
 
What do these indexes look like?
Like this when you are zoomed out:
http://www.mflan.com/maps/index.jpg
When you zoom in in the GIS program each square has a map name in it.


Info.

Both zip files have shape files (SHP, SHX, DBF, PRJ) that can be read by many GIS programs.
They simply show a grid of boxes on a map of the US. With slight modifications they also show the name of the map denoted by the rectangle.
See below for how to obtain QGIS.



USA
"topo_index_usa.zip" contains:

3.75 minute topo index - All 50 states
7.5 minute topo index - All 50 states (24k)
15 minute topo index - All 50 states (62.5k)
30x60 minute topo index - 49 states (not AK) (100k)
1x1 degree topo index - All 50 states
1x2 degree topo index - All 50 states (250k)
A "statep010" shape file that shows state boundaries.


The file above takes the best from 2 files obtained from the internet, with more than 100 corrections made.
Therefore, it is not recommended to get the original data, but if you want to they are here:

ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Map_Indices/Shape/
Get "Cells_National.zip" at the bottom of that page.

And
http://gis.burbankca.gov/files/topoindex/topo_index.zip



CANADA
"nts_snrc.zip" contains:

1 meter topo index
1:50k topo index
1:250k topo index
A providence territory outline shapefile

You can also download this from the original supply site:
http://ftp2.cits.rncan.gc.ca/pub/index/nts_snrc.zip
So far there have been no modifications to the original file.




Another site that provides topo indexes for the entire world is here:
Interactive Map

It appears to be fairly accurate in the US.
So if you just want to look up one map name via a location, it might be a good source.


Don't know how to use the files provided above?
Contact me at temp3@mflan.com and we can discuss it.
One thing you will probably need is the QGIS program. It is totally free:
http://www.qgis.org/en/site/forusers/download.html


Don't want the index files, but instead you want the maps?
Contact me at temp3@mflan.com and we can discuss it.
They are generally free.


Regarding the names of the topo maps, preference is given to the recent name where the name changes over time.
Preference is given to the name listed on the recent maps. So if the map says "Mtn" instead of "Mountain", we use "Mtn".
Note that periods are dropped. So if the map says "Mtn." we use "Mtn".
If the map says "St." instead of "Saint", we use "St".
So why are there so many "Mountain"'s in the names? Only because I didn't have those maps, so I couldn't easily check the map listing.

In some cases preference is given to the GNIS official name. So if the map is named after the town of McKinney, and "Mc Kinney" is shown on the map, we use "McKinney".

We welcome corrections. The best way to submit corrections is in a tab or comma delimited file like this:
Avant         OK  62.5  36096-C1
New Egypt NJ   24.0  40074-A5
Maben        MS  62.5  33089-E1

Please submit them to temp3@mflan.com.


Some facts:

4 '3.75 minute' topos fit inside 1 '7.5 minute' topo.
4 '7.5 minute' topos fit inside 1 '15 minute' topo.
4 '30x60 minute' topos fit inside 1 '1x2 degree' topo.

A state like Missouri has about 1,100 '7.5 minute' topos.






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temp3@mflan.com