- Satellite products
- radar
- elevation models
Application
Services
Company
|
DEMs
DEMs (Digital Elevation Models), as sold by Geoserve, are raster
files where each cell (pixel) contains a height indication. This height
value shows the average ground elevation on the Earth surface.
We deliver DEMs from the following satellites:
| Satellite |
Area
km*km |
Posting
XY |
Accur.
XY⊗ |
Accur.
Z⊗ |
Indicated
Price § |
Minimum
km² |
|---|
| WorldView-1/2 |
10x10 |
1m |
8m |
6m |
€37.00 |
210 |
| GeoEye-1 |
15x15 |
1m |
4m |
6m |
€55.00 |
100 |
| Cartosat-1 |
27x27 |
5m |
10m |
10m |
€7.20 |
729 |
| Ikonos |
11x11 |
2m |
15m |
10m |
€47.00 |
100 |
| TerraSAR-X |
30x50 |
10m |
10m |
10m |
€7.00 |
1350 |
| SPOT-DEM |
120x600 |
30m |
15m |
10m |
€2.30 |
♦3000 |
SPOT-DEM
Precission |
120x600 |
30m |
15m |
10m |
€4.50 |
♦3000 |
SPOT-DEM
Reference 3-D |
120x600 |
30m |
15m |
10m |
€7.00 |
♦3000 |
| STRM-90 |
global |
90m |
50m |
15m |
€0.005 |
11000 |
| Aster |
60x60 |
30m |
20m |
20m |
€0.014 |
3600 |
| Envisat ASAR |
70x100 |
50m |
40m |
64m |
€0.39 |
7000 |
| Radarsat 1&2 |
90x100 |
50m |
40m |
64m |
€1.27 |
9000 |
⊗) without use of Ground Control Points (GCP) and other
reference material (like areal photographs). To CE90 resp. LE90.
§) indication of the price per km², depends on exchange rates, among
other things.
♦) smaller areas possible against heigher km² prices.
"SPOT-DEM Precission" is a SPOT-DEM with additional meta-data about
source, quality and accuracy. "SPOT-DEM Reference 3D" also add an HRS otho
image.
Application
DEMs are, amongst other applications, used for
- Satellite imagery corrections (ortho-rectification): the angle
of observation displaces the information, especially when mountains
are in the area. DEMS are used to "flatten" these images, to repair
the mapping to groundpoints.
- Waterflow models over land
- Terrain models and visualisation
Producing DEMs
Low resolutions DEMs are readily available for the whole Earth
surface. However, when you need to look at land change processes or
require a higher level of details, you can have produced DEMs on
demand.
DEMs are produced from optical or radar satellite products, which
contain two different views of the area at stake. There are three ways
to collect these pairs:
- Using one satellite, which in its track is capable of taking
to images of the same area with little time in between. For instance,
Aster is able to capture Nadir and Backward.
- Having two satellite besides or along each other, capturing the
same area at the same moment.
- Have one satellite take two pictures of the same area under a
different view angle. There will be one orbit (one-and-half hour)
between the two captures.
|
Products
(click for enlargements)
Information
info@geoserve.nl
+31-527-24 10 10
|
