What does PhotoSat deliver to me?

Standard PhotoSat surveying package Common Formats (Additional formats available)
50cm colour or grayscale precision satellite orthophoto Floating point GeoTIFF
20cm or 30cm accuracy 1m bare earth elevation grid (DEM/DTM) Elevation grid: Floating Point GeoTIFF or MIG (MapInfo compatible) or ASCII XYZ or DXF
50cm or 1m contours (plus 5m, 10m and 50m contours) Contours: 3D ArcGIS Shapefile or 2D MapInfo or 3D DWG
Colour elevation image (in areas of sparse vegetation) Floating point GeoTIFF
Direction of slope image (in areas of sparse vegetation) Floating point GeoTIFF

Orthophoto                                                    1m bare earth survey grid                             Contours

Orthophoto Mexico mine

PhotoSat’s natural colour orthophotos are colour balanced, mosaicked and atmospherically compensated.

1m bare earth survey grid

The image is a survey grid with elevation values every meter. 50 cm elevation grid is also available upon request.

1m contours

1 m contours are derived from the survey, using a custom algorithm to smooth noise while preserving topographic detail.

Colour elevation image                                 Slope direction image

Colour elevated image

The image is coloured, shaded and highlighted to clearly show the survey details. Blue is low elevation and red is high elevation.

1m slope elevation in Kurdistan

Slope direction is used to enhance the surface expressions of geological structures. North facing slopes are bright, south facing are dark, easting facing are blue and west facing are gold.

Thinned Grids:

PhotoSat surveys can cover large areas resulting in large file sizes. PhotoSat can deliver thinned files, which makes opening and working with these files much easier. See thinned grids for more details.

 

Additional Deliverables:

License Agreements:

  • DigitalGlobe License Agreement or Airbus: Pleiades End-User License Agreement
  • PhotoSat General Terms of Sale

Accuracy & Ground Control

PhotoSat’s elevation grids have been demonstrated to have a relative vertical accuracy of 15cm to 30cm RMSE, and a relative horizontal accuracy of 50cm RMSE over horizontal distances of 10km. See PhotoSat accuracy discussion for more details on surveying accuracy.

  • To achieve 30cm RMSE absolute accuracy, a minimum of 3 survey ground control points accurate to better than 10cm are required for areas up to 200km²
  • To achieve 20cm RMSE absolute accuracy, a minimum of 10 survey ground control points accurate to better than 10cm are required for areas up to 100km²
  • To achieve 15cm RMSE absolute accuracy, a minimum of 100 survey ground control points accurate to better than 10cm are required for areas up to 100km²

For larger projects, we request one ground control point every additional 200km². In the absence of ground control points, the relative accuracy specifications apply and absolute accuracy is expected to be better than 3m RMSE.  See PhotoSat ground control guidelines for more details on surveying ground control points.

For more information on PhotoSat surveying products, see the following:

PhotoSat surveying accuracy overview
PhotoSat accuracy studies
PhotoSat case histories

 

To talk to a PhotoSat survey expert, email info@photosat.ca or phone 1-604-681-9770

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