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GeoInformatics-7-2009
article figure 4: full resolution orthorectified rapideye phoenix data corrected without gcps overlaid with usgs 1:24000 vectors for gcps. this would be an immense benefit to numerous applications where accurately-corrected orthos are needed as soon as possible. in this article, we will use different rapideye data to test and explore orthorectification accuracy without the use of gcps. without gcps. level 1b data were obtained for the following areas: (1) irvine, california, usa. (2) phoenix, arizona, usa, and (3) zlin and koprivnice regions, czech republic. geometric correction method and software rapideye test data each rapideye 1b data is supplied with 5 bands in nitf format. in addirapideye standard image products can be purchased in two product tion, rational polynomial coefficients (rpc) are provided with the data, levels, depending on the task at hand. (1) rapideye basic product which enables the use of rpc model to orthorectify the data. more (level 1b): this data has had radiometric and sensor corrections applied details about the rpc model can be found in the paper written by to it, as well as on-board spacecraft attitude and ephemeris. (2) grodecki and dial (block adjustment of high-resolution satellite images rapideye ortho product (level described by rational functions 3a): offers the highest level pro- pe &rs january, 2003). since cessing available. radiometric, biases or errors still exist in the sensor and geometric correcrpcs, the results can be posttions have been applied to the processed with a polynomial data. these have been rectified adjustment and several accurate using a dted level 1 srtm dem gcps. or better, and with appropriate the latest version of pci gcps can meet an accuracy of geomatics orthoengine soft6m 1-sigma (12.7 ce90). the ware was used for this testing. highest accuracy that can be this software supports reading achieved by these products of the data, manual or automatmeets 1:25,000 nmas stanic gcp/tie point (tp) collection, dards. geometric modeling of different most users would prefer to use satellites using toutin s rigorous level 1b data because they can model or the rpc model, autouse their own gcps and dems matic dem generation and editto generate orthos. in this artiing, orthorectification, and cle we will test the correction figure 5: full resolution orthorectified rapideye phoenix data corrected without gcps either manual or automatic accuracy of 1b data with and mosaicking. overlaid with google earth october/november 2009 38
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