try:
http://www.imagelinks.com/pages/products/sample.htm
also try: http://www.landinfo.com/1_mexico.htm
This was what I found for the above link to landinfo:
3D MODELS, TOPOGRAPHIC MAPS, CONTOURS,
FEATURE LAYERS NOW AVAILABLE FOR MEXICO
LAND INFO offers nationwide data coverage for Mexico. Digital topographic
maps are available in both 1:50,000 and 1:250,000 scales Digital Elevation
Models (DEM) are available in 30-meter and 90-meter grid posting formats.
Extracted road, contour, hydrology, and other map features are also
available. The digital datasets are fully geo-referenced to accommodate use
with GPS, GIS, and engineering applications. Special pricing is offered for
Mexican State bundles.
LAND INFO color scans paper topographic maps to produce a high resolution,
digital image. Latitude and longitude coordinates are then
Mexico contours & DEMs are based on topographic maps
assigned to each map. This enables engineers, GIS project managers, and
other end users, to overlay other geospatial data on top of the base
topographic map. For example, oil & gas engineers may overlay satellite
photos and proprietary pipeline data on top of the topographic map for
analysis purposes.
LAND INFO also offers a variety of derivative products based on the Mexico
topographic maps, including digital elevation models (DEM) and extracted
feature layers. The DEM dataset is created by extracting the contour
elevation data from the source map. This contour data is then formatted to
create a 3D interpretation of the land area. Extracted feature layers, such
as roads and waterways, are produced through a similar process.
Lori D. Collins, M.A.
Archaeologist/GIS
Southeastern Archaeological Research, Inc.
[log in to unmask]
(813)988-1341
|