Free download SRTM Data for entire world

The CGIAR-CSI GeoPortal is able to provide SRTM 90m Digital Elevation Data for the entire world. The SRTM digital elevation data, produced by NASA originally, is a major breakthrough in digital mapping of the world, and provides a major advance in the accessibility of high quality elevation data for large portions of the tropics and other areas of the developing world. The SRTM digital elevation data provided on this site has been processed to fill data voids, and to facilitate it's ease of use by a wide group of potential users. This data is provided in an effort to promote the use of geospatial science and applications for sustainable development and resource conservation in the developing world. Digital elevation models (DEM) for the entire globe, covering all of the countries of the world, are available for download on this site.

The SRTM 90m DEM's have a resolution of 90m at the equator, and are provided in mosaiced 5 deg x 5 deg tiles for easy download and use. All are produced from a seamless dataset to allow easy mosaicing. These are available in both ArcInfo ASCII and GeoTiff format to facilitate their ease of use in a variety of image processing and GIS applications. Data can be downloaded using a browser or accessed directly from the ftp site

For direct download please click here download SRTM Data

User can input co-ordinates of their choice, in different modes (Decimal Input, Deg/Min/Sec). Minimum and Maximum extremes have to be specified for both longitude and latitude.

Technical Documents IKONOS , QuickBird, and SPOT-5

Technical Documents IKONOS , QuickBird, and SPOT-5. The following Technical Documents resources about High Resolution Satellite Sensors includes  IKONOS , QuickBird, and SPOT-5


IKONOS

    * IKONOS Geometry Accuracy - J. Grodecki and G. Dial — PDF (163 KB)
    * IKONOS Geometric Accuracy Validation - J. Grodecki and G. Dial — PDF (374 KB)

QuickBird

    * QuickBird Imagery Product Frequently Asked Questions (FAQ) — PDF (188 KB)

SPOT-5

Type of ALOS sensors ( Panchromatic sensor, Multispectral sensors, Radar sensors)

ALOS has three sensors on the satellite that consists of panchromatic sensor, Multispectral sensors and Radar sensors with details as below: :

1. Panchromatic sensor, named PRISM. It's like aerial photography, resolution 2.5
m.

2. Multispectral sensors, called AVNIR-2. It's like ASTER or Landsat.
AVNIR-2 consists of 4 bands VNIR, 10 m spatial resolution

3. Radar sensors, called PALSAR. It's like RADARSAT or TerraSAR-X but
with a lower resolution, 10 m up to several tens of meters depending on the mode retrieval of data.

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