Academia.eduAcademia.edu

Figure 10 – uploaded by Daniela Carrion

See full PDFdownloadDownload figure
allows the conclusion that these areas are, more likely, the most reliable estimates of the geoid. 4.3 Comparison of geoids on overlapped areas

Figure 10 allows the conclusion that these areas are, more likely, the most reliable estimates of the geoid. 4.3 Comparison of geoids on overlapped areas

Related Figures (18)

Figure 1. Geoid repository. (a) number of available geoid models covering the same area, blank means missing data;
Figure 1. Geoid repository. (a) number of available geoid models covering the same area, blank means missing data;
Figure 2. Geoid repository, example of a webpage describing the content of the selected available geoid.
Figure 2. Geoid repository, example of a webpage describing the content of the selected available geoid.
) Figure 3: Overview on the relation between ISG and GFZ Data Services for DOI-referenced geoid models of the Colorado experiment (ColWLSC2020). This project includes a quasi-geoid model (Barzaghi et al., 2020a) and a geoid model (Barzaghi et al., 2020b). Both models can be accessed via the dedicated webpage in the ISG geoid repository (on the left) and via the DOI landing pages in the GFZ Data Services (on the right). The “File” section of the DOI landing pages and in the DataCite metadata of each model. The DOI links are also added to the model pages at ISG (see figure 3)
) Figure 3: Overview on the relation between ISG and GFZ Data Services for DOI-referenced geoid models of the Colorado experiment (ColWLSC2020). This project includes a quasi-geoid model (Barzaghi et al., 2020a) and a geoid model (Barzaghi et al., 2020b). Both models can be accessed via the dedicated webpage in the ISG geoid repository (on the left) and via the DOI landing pages in the GFZ Data Services (on the right). The “File” section of the DOI landing pages and in the DataCite metadata of each model. The DOI links are also added to the model pages at ISG (see figure 3)
Figure 4. Web page to access the ISG height conversion web-service
Figure 4. Web page to access the ISG height conversion web-service
Table 1. List of the Geoid Schools organized by ISG since its foundation.
Table 1. List of the Geoid Schools organized by ISG since its foundation.
Table 2. Statistics of the differences between the analysed Japanese geoids.
Table 2. Statistics of the differences between the analysed Japanese geoids.
Due to the different resolutions and grid boundaries, the comparison has been done stepwise by interpolating the most recent
Due to the different resolutions and grid boundaries, the comparison has been done stepwise by interpolating the most recent
suggest disagreement between the two refinements. 4.2 Comparison of geoids computed by different authors and with different techniques The ISG repository contains also collections of the same national geoid computed with different techniques by different
suggest disagreement between the two refinements. 4.2 Comparison of geoids computed by different authors and with different techniques The ISG repository contains also collections of the same national geoid computed with different techniques by different
mismatches due to different datum and reference frame. analyses have been conducted on the residuals obtained after removing the interpolating plane, which models possible
mismatches due to different datum and reference frame. analyses have been conducted on the residuals obtained after removing the interpolating plane, which models possible
Figure 9. Sudanese geoids comparison, residuals with absolute value less than 1 meter. (a) case A; (b) case B; (c) case Table 3. Statistics of the difference between the analysed Sudanese geoids. (ranging from 75% to 82%), their spatial distribution is quite different, as shown in Figure 9.
Figure 9. Sudanese geoids comparison, residuals with absolute value less than 1 meter. (a) case A; (b) case B; (c) case Table 3. Statistics of the difference between the analysed Sudanese geoids. (ranging from 75% to 82%), their spatial distribution is quite different, as shown in Figure 9.
Table 4. Statistics of the difference between the analysed geoids over the Sao Paulo region (BRA). As expected, the standard deviation of the residuals decreases by comparing more localized geoid models. In fact, the residuals
Table 4. Statistics of the difference between the analysed geoids over the Sao Paulo region (BRA). As expected, the standard deviation of the residuals decreases by comparing more localized geoid models. In fact, the residuals
cm. Figure 12 shows the spatial distribution of these residuals.
cm. Figure 12 shows the spatial distribution of these residuals.
as an example for such an assessment. The first model is the recent ColWLSC2020 (Barzaghi et a., 2020b) gravimetric geoid model, computed by the Department of Ihe agreement between local and global models can be assessed, as well. Global models can be used at their full resolution to
as an example for such an assessment. The first model is the recent ColWLSC2020 (Barzaghi et a., 2020b) gravimetric geoid model, computed by the Department of Ihe agreement between local and global models can be assessed, as well. Global models can be used at their full resolution to
Table 5. Statistics of the differences between the analysed Colorado geoids. From these statistics, it can be noted that over this area the two global models are quite in agreement, with differences of at these three geoid models.
Table 5. Statistics of the differences between the analysed Colorado geoids. From these statistics, it can be noted that over this area the two global models are quite in agreement, with differences of at these three geoid models.
5 Figure 14 shows the spatial distribution of such residuals. As one can see, the main differences can be found on the Rocky Mountains along the meridian at 255° E and, in smaller part,
5 Figure 14 shows the spatial distribution of such residuals. As one can see, the main differences can be found on the Rocky Mountains along the meridian at 255° E and, in smaller part,
of the percentage of grid points where all the three models differ by less than one, two, three times o. As shown in Figure 15, Being the model ColWLSC2020 compared against GSVS17 GPS/levelling with residuals of about 2.5 cm, it seems that the
of the percentage of grid points where all the three models differ by less than one, two, three times o. As shown in Figure 15, Being the model ColWLSC2020 compared against GSVS17 GPS/levelling with residuals of about 2.5 cm, it seems that the
Related topics:
Geodesy
580 California St., Suite 400
San Francisco, CA, 94104
© 2025 Academia. All rights reserved