Digital Terrain data is all we need. You can explore the links given. We will download from SRTM. You can read the documentation for information. Click on SRTM 3. Here you can determine the coordinates of the tile in which your location is lying.
You must know where your location is on earth i. North East or North West etc. As you determine the coordinates of tile, go to previous page and Click on the map where your location is. Now click the tile from the index you determined from the large map. Thanks a lot! At southern negative latitudes ex. How do I avoid this distortion? Could you help me on this?
Here are some options for you. For crops, it really depends on the time of season, stage of growth and types of crops for any NDVI analysis. Nice list, thanks for featuring OpenTopography. But do not know where I can download. Hi-does anyone here have a suggestion of software I can use to help bring out deep details in mountainous terrain?
Thanx for the list. Its called DEM1. I like it so far in use with the Mapping-App OruxMaps. Thanks for nice overview! However, I just discovered a serious mistake.. WorldDEM is the future. Your email address will not be published. Skip to content. Sure you do. Subscribe to our newsletter:. Thanks, and any advice on this would be greatly appreciated. Thanks for the links! World Wind Central. This is the best site for beginners.
Easy user interface, great true-color images in a friendly format jpg. It will even provide the corresponding NIMA air navigation map and overlay your satellite image.
Drawbacks: incomplete coverage, lots of clouds in many images, high camera obliquity for many images. Definitely worth checking out. Absolutely great for school kids and in fact aimed at this audience. Global Land Cover Facility. However, the Landsat 7, MODIS and other datasets can be daunting for the inexperienced, so beginners can expect to spend many many hours producing images from this data.
Some of the issues to be dealt with: the data is presented in multiple bands spanning the ir, visible and uv electro magnetic spectra. Band data is contained in files each of which is tens of megabytes large. Creating true color RGB images takes a bit of work and a lot of computing power.
However, this is one of the most important data sets for researchers and also for terrain modelers. See the article on this site. Unfortunately, USA only. Global coverage; spectacular images composed of Landsat TM bands 7, 4 and 2. These are not true color images but you do not have to composite them yourself. This site periodically disappears from the internet.
Space Imaging Quicklook. This site is meant to be an index and teaser for the spectacular and spectacularly expensive, for the amateur Space Imaging full-resolution imagery. NGA Raster Roam. This site seems to be substantially broken. Highly recommended. JPL's OnEarth. Source for much of World Wind data. You will have to do some digging to get anything out of this one. Coverage is not yet complete but presumably this will be increasing as Natural Resources Canada completes the collection.
Digital Topographic Map Library. Stanford University Libraries and Academic Resources. This is not actually a source of topographic maps, but is instead one of the most comprehensive listing of USA state mapping and GIS agencies. These agencies are often the best source of not only free USGS topographic maps for their state, but often also for tons of other valuable data like DOQQs, tax plats, etc. The University of Oregon site is one of the best listings.
UC Berkeley Map Library. Free Russian topos! For all you non-USA cartographers looking for free topos, this site may help. Very incomplete world coverage and not all of the collection is available on line. However this is one of the only free sources of Russian topos on the internet, and certainly the largest. Doc Savage Archeology Site. This guy is a real-life Indiana Jones who has spent a good chunk of his life conducting archeological studies in Israel and Jordan.
Plenty of very interesting information on his site, including a fine collection of Middle East topographic maps that you can download. Very limited coverage, but excellent source of very unusual maps, including topos published by the Royal Jordanian Geographic Centre. The maps are offered in several formats, including with and without collars. See the 'Lavant Topos' link. Air navigation charts for much of Asia. Jim Henthorn's Project MapScan. Awesome, awesome, awesome collection of scanned topographical maps for all of Southeast Asia.
Veteran Jim Henthorn has done an outstanding piece of work. Check this out, it is awesome. Lemkos Poland.
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