elevacao
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| Ambos lados da revisão anteriorRevisão anteriorPróxima revisão | Revisão anterior | ||
| elevacao [2012/05/03 19:55] – laercio | elevacao [2015/11/20 13:03] (atual) – laercio | ||
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| === Autoria === | === Autoria === | ||
| Laércio M. Namikawa - laercio@dpi.inpe.br | Laércio M. Namikawa - laercio@dpi.inpe.br | ||
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| Modelos Digitais de Elevação tem sido utilizados para diversas aplicações, | Modelos Digitais de Elevação tem sido utilizados para diversas aplicações, | ||
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| ===== Modelagem Digital de Terreno ===== | ===== Modelagem Digital de Terreno ===== | ||
| [[geopro: | [[geopro: | ||
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| + | | Grade Regular | ||
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| + | | TIN |{{elevacao: | ||
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| + | ===== Research Topics Ideas ===== | ||
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| + | ==== MultiResolution Rectangular Grid Model ==== | ||
| + | === Questions === | ||
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| + | == Is it better than TIN? == | ||
| + | What is better? Less computer demanding - storage and processing.\\ | ||
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| + | == Which Data Structure to use? == | ||
| + | What is available? Are there any OGC standards? | ||
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| + | == How to define the different resolutions and where they are? == | ||
| + | Can we use a variation of VIP algorithm? | ||
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| ===== Tópicos da Pesquisa ===== | ===== Tópicos da Pesquisa ===== | ||
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| === Federal Geographic Data Committee - Geospatial Positioning Accuracy Standards === | === Federal Geographic Data Committee - Geospatial Positioning Accuracy Standards === | ||
| + | == Spatial Accuracy == | ||
| + | The NSSDA uses root-mean-square error (RMSE) to estimate positional accuracy. RMSE is the | ||
| + | square root of the average of the set of squared differences between dataset coordinate values and | ||
| + | coordinate values from an independent source of higher accuracy for identical points. \\ | ||
| + | Accuracy is reported in ground distances at the 95% confidence level. Accuracy reported at the 95% | ||
| + | confidence level means that 95% of the positions in the dataset will have an error with respect to true ground position that is equal to or smaller than the reported accuracy value. | ||
| + | == Accuracy Test Guidelines == | ||
| + | The data producer shall determine the geographic extent of testing....Vertical accuracy | ||
| + | shall be tested by comparing the elevations in the dataset with elevations of the same points as | ||
| + | determined from an independent source of higher accuracy. \\ | ||
| + | A **minimum of 20 check points** shall be tested, distributed to reflect the geographic area of interest and the distribution of error in the dataset. | ||
| + | **Vertical Accuracy** | ||
| + | Let: \\ | ||
| + | RMSEz = sqrt[ SUM(zdata i - zcheck i)^2 /n] \\ | ||
| + | where \\ | ||
| + | z data i is the vertical coordinate of the i th check point in the dataset. \\ | ||
| + | z check i is the vertical coordinate of the i th check point in the independent source of higher accuracy \\ | ||
| + | n = the number of points being checked \\ | ||
| + | i is an integer from 1 to n \\ | ||
| + | It is assumed that systematic errors have been eliminated as best as possible. If vertical error is normally distributed, | ||
| + | NSSDA shall be computed by the following formula: \\ | ||
| + | Accuracyz = 1.9600 *RMSEz. | ||
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| - | ==== PG-CAP | + | |
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| + | ==== PG-CAP | ||
| [[http:// | [[http:// | ||
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| JPL-NASA (2003). ASTER: Advanced Spaceborne Thermal Emission and Reflection Radiometer. 2003. | JPL-NASA (2003). ASTER: Advanced Spaceborne Thermal Emission and Reflection Radiometer. 2003. | ||
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| + | SRTM DLR X_SAR | ||
| + | http:// | ||
| + | http:// | ||
| === ASTER === | === ASTER === | ||
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| - | ==== Dados Disponíveis ==== | + | |
| + | ==== Worldwide Data Availability - Dados Disponíveis | ||
| === SRTM === | === SRTM === | ||
| Topographic data acquired during the Shuttle Radar Topography Mission (SRTM), in February 2000, flew onboard Space Shuttle Endeavour. The SRTM radar contained two types of antenna panels, C-band and X-band. C-band data processed at the Jet Propulsion Laboratory and X-band processed and distributed by DLR. (JPL-NASA, 2002) | Topographic data acquired during the Shuttle Radar Topography Mission (SRTM), in February 2000, flew onboard Space Shuttle Endeavour. The SRTM radar contained two types of antenna panels, C-band and X-band. C-band data processed at the Jet Propulsion Laboratory and X-band processed and distributed by DLR. (JPL-NASA, 2002) | ||
| + | == Download == | ||
| + | Research Data\\ | ||
| + | http:// | ||
| **Accuracy** | **Accuracy** | ||
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| * vertical accuracy (absolute): | * vertical accuracy (absolute): | ||
| * vertical accuracy (relative): | * vertical accuracy (relative): | ||
| + | == Download == | ||
| + | http:// | ||
| === ASTER === | === ASTER === | ||
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| * One study at a site in British Columbia(Canada) showed errors of 28 meters for 68% level of confidence and 51 meters for the 90 % level of confidence, with errors ranging from -151 to 167 meters, after eliminating mismatched areas and correcting lakes. (Toutin 2002) | * One study at a site in British Columbia(Canada) showed errors of 28 meters for 68% level of confidence and 51 meters for the 90 % level of confidence, with errors ranging from -151 to 167 meters, after eliminating mismatched areas and correcting lakes. (Toutin 2002) | ||
| + | == Download == | ||
| + | http:// | ||
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| + | === How-To === | ||
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| + | [[SRTM_no_SPRING: | ||
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| [[: | [[: | ||
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| + | ===== Aplicações ===== | ||
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| + | [[: | ||
elevacao.1336074922.txt.gz · Última modificação: 2012/05/03 19:55 por laercio