Altimetric profiles of Amazon rivers and gage levels gained by GPS-PPP
Abstract
A key application of GNSS data for hydrology is the characterization of river altimetric profiles, including the levelling of gauges. In the present work we use the GINS-PC software developed at CNES/GRGS to determine thousands of kilometers long altimetric profile along the major rivers of the Amazon basin. The profiles are processed using data obtained from GPS receivers installed on board boats. We present the capability of the PPP kinematic with integer ambiguities fixing strategy implemented in GINS-PC in processing GPS data collected with moving stations. We point on the specific corrections and cautions that are necessary during the data collection and the data processing. The accuracy of the profiles is evaluated by comparing the results with fix points at gauge stations, or by comparing solutions obtained for several stations installed on the same boat Base applications of the method are to enable the leveling of 1- remote gages without any specific field work but initial installation of GPS stations on boats cruising the river network and 2- leveling of cross sections for the determination of the riverbed slope. Examples are presented with accuracy assessment. These profiles are further used to assess the capability of other space technics to provide altimetric profiles of rivers, namely DEMs such as SRTM, ACE2 or ASTER in the one hand and radar altimetry (JASON-2, ENVISAT) in the other hand.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFM.G53B0927M
- Keywords:
-
- 1240 GEODESY AND GRAVITY Satellite geodesy: results;
- 1840 HYDROLOGY Hydrometeorology