{"id":797,"date":"2023-03-29T16:48:48","date_gmt":"2023-03-29T16:48:48","guid":{"rendered":"https:\/\/www.gislxz.com\/?p=797"},"modified":"2023-03-29T16:48:49","modified_gmt":"2023-03-29T16:48:49","slug":"gdal%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%882%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.gislxz.com\/index.php\/2023\/03\/29\/gdal%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%882%ef%bc%89\/","title":{"rendered":"GDAL\u5b66\u4e60\u7b14\u8bb0\uff082\uff09"},"content":{"rendered":"\n<p>\u6458\u81ea\u300aGDAL\u6e90\u7801\u5256\u6790\u4e0e\u5f00\u53d1\u6307\u5357\u300b \u674e\u6c11\u5f55<\/p>\n\n\n\n<p>\u4e66\u91cc\u7684\u5185\u5bb9\u5e94\u8be5\u662f\u6765\u81ea\u5b98\u65b9\u6587\u6863\u7684Raster Data Model<\/p>\n\n\n\n<p><a href=\"https:\/\/gdal.org\/user\/raster_data_model.html\" target=\"_blank\"  rel=\"nofollow\" >Raster Data Model \u2014 GDAL documentation<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">GDAL\u6570\u636e\u96c6\u603b\u4f53\u6982\u51b5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6570\u636e\u96c6\uff08Dataset\uff09<\/h3>\n\n\n\n<p>\u6570\u636e\u96c6\u662f\u7531\u6805\u683c\u6ce2\u6bb5\u548c\u4e00\u4e9b\u76f8\u5173\u7684\u4fe1\u606f\u5171\u540c\u7ec4\u6210\u7684\uff08\u5177\u4f53\u53c2\u8003GDALDataset\u7c7b\uff09\u3002\u5728\u4e00\u4e2a\u6570\u636e\u96c6\u4e2d\u6240\u6709\u7684\u6ce2\u6bb5\u90fd\u5177\u6709\u76f8\u540c\u7684\u5927\u5c0f\uff0c\u5373\u56fe\u50cf\u884c\u6570\u548c\u5217\u6570\u76f8\u7b49\uff1b\u76f8\u5173\u4fe1\u606f\u5305\u62ec\u8be5\u6570\u636e\u7684\u5730\u7406\u5750\u6807\u3001\u6295\u5f71\u4fe1\u606f\u4ee5\u53ca\u4e00\u4e9b\u5143\u6570\u636e\u4fe1\u606f\u7b49\uff0c\u5176\u4e2d\u5143\u6570\u636e\u4fe1\u606f\u662f\u7531\u5f62\u5982\"\u540d\u79f0\uff1a\u503c\"\u7684\u5b57\u7b26\u4e32\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\u5217\u8868\u3002\u4e0b\u9762\u5c0f\u8282\u4e2d\u7684\u6240\u6709\u5185\u5bb9\u90fd\u662f\u6570\u636e\u96c6\u4e2d\u5305\u542b\u7684\u4fe1\u606f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5750\u6807\u7cfb\u7edf\uff08Coordinate System\uff09<\/h3>\n\n\n\n<p>\u6570\u636e\u96c6\u4e2d\u7684\u5750\u6807\u7cfb\u7edf\u662f\u4f7f\u7528OpenGIS\u7684WKT\uff08WellKnown Text\uff09\u5b57\u7b26\u4e32\u683c\u5f0f\u6765\u8868\u793a\u7684\uff0c\u5305\u542b\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5750\u6807\u7cfb\u7edf\u540d\u79f0<\/li><li>\u5730\u7406\u5750\u6807\u7cfb\u7edf\u540d\u79f0<\/li><li>\u5927\u5730\u6c34\u51c6\u9762<\/li><li>\u692d\u7403\u4f53\u540d\u79f0\u3001\u957f\u534a\u8f74\u548c\u6241\u7387<\/li><li>\u4e2d\u592e\u7ecf\u7ebf\u540d\u79f0\uff0c\u4e0e\u672c\u521d\u5b50\u5348\u7ebf\u7684\u504f\u79fb\u91cf<\/li><li>\u6295\u5f71\u65b9\u5f0f\uff08\u5982\u6a2a\u8f74\u58a8\u5361\u6258\u6295\u5f71\uff09<\/li><li>\u6295\u5f71\u53c2\u6570\u5217\u8868\uff08\u5982\u4e2d\u592e\u7ecf\u7ebf\uff09<\/li><li>\u4e2d\u592e\u7ecf\u7ebf\u540d\u79f0\u3001\u4e0e\u672c\u521d\u5b50\u5348\u7ebf\u7684\u504f\u79fb\u91cf\u6295\u5f71\u65b9\u5f0f\uff08\u5982\u6a2a\u8f74\u58a8\u5361\u6258\u6295\u5f71\uff09\u6295\u5f71\u53c2\u6570\u5217\u8868\uff08\u5982\u4e2d\u592e\u7ecf\u7ebf\uff09<\/li><li>\u5355\u4f4d\u540d\u79f0\u3001\u5355\u4f4d\u4e0e\u7c73\u6216\u8005\u5f27\u5ea6\u4e4b\u95f4\u7684\u8f6c\u6362\u7cfb\u6570\u5750\u6807\u8f74\u540d\u79f0\u548c\u987a\u5e8f\u4ee5\u4e0a\u5404\u9879\u5bf9\u5e94\u7684EPSG\u4ee3\u7801<\/li><li>\u4ee5\u4e0a\u5404\u9879\u5bf9\u5e94\u7684EPSG\u4ee3\u7801<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u4eff\u5c04\u5730\u7406\u5750\u6807\u8f6c\u6362\uff08Affine GeoTransform\uff09<\/h4>\n\n\n\n<p>\u4eff\u5c04\u53d8\u6362\u5305\u542b\u516d\u4e2a\u53c2\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570GDALDataset\uff1aGetGeoTransform\uff08\uff09\u83b7\u53d6\uff0c\u8fd9\u516d\u4e2a\u53c2\u6570\u7528\u4e00\u4e2adouble\u30106\u3011\u6570\u7ec4\u6765\u8868\u793a\uff0c\u542b\u4e49\u5206\u522b\u5982\u4e0b\uff0c\u5176\u4e2d\u524d\u9762\u7684\u5e8f\u53f7\u4e3a\u8be5\u6570\u7ec4\u7684\u4e0b\u6807\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u56fe\u50cf\u5de6\u4e0a\u89d2\u7684X\u5750\u6807<\/li><li>\u56fe\u50cf\u6a2a\u5411\uff08\u4e1c\u897f\u65b9\u5411\uff09\u7684\u5206\u8fa8\u7387<\/li><li>\u65cb\u8f6c\u89d2\u5ea6\uff0c\u5982\u679c\u56fe\u50cf\u5317\u65b9\u671d\u4e0a\uff0c\u8be5\u503c\u4e3a0<\/li><li>\u56fe\u50cf\u5de6\u4e0a\u89d2\u7684Y\u5750\u6807<\/li><li>\u65cb\u8f6c\u89d2\u5ea6\uff0c\u5982\u679c\u56fe\u50cf\u5317\u65b9\u671d\u4e0a\uff0c\u8be5\u503c\u4e3a0<\/li><li>\u56fe\u50cf\u7eb5\u5411\uff08\u5357\u5317\u65b9\u5411\uff09\u7684\u5206\u8fa8\u7387<\/li><\/ul>\n\n\n\n<p>\u901a\u8fc7\u4e0a\u9762\u7684\u8bf4\u660e\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u77e5\u56fe\u50cf\u884c\u5217\u53f7\u548c\u5730\u7406\u7a7a\u95f4\u5750\u6807\u4e4b\u95f4\u7684\u53d8\u6362\u5173\u7cfb\u5982\u4e0b\u3002<\/p>\n\n\n\n<p>Xgeo=GT(0)+Xpixel*GT(1)+Yline*GT(2)Ygeo=GT(3)+Xpixel*GT(4)+Yline*GT(5)<\/p>\n\n\n\n<p>\u5728\u5317\u65b9\u5411\u4e0a\u7684\u56fe\u50cf\u4e2d\uff0c\u53c2\u6570GT\uff082\uff09\u548cGT\uff084\uff09\u7684\u503c\u662f0\uff0cGT\uff081\uff09\u8868\u793a\u50cf\u5143\u5bbd\u5ea6\uff0cGT\uff085\uff09\u8868\u793a\u50cf\u5143\u9ad8\u5ea6\u3002\u70b9\uff08GT\uff080\uff09\uff0cGT\uff083\uff09\uff09\u8868\u793a\u56fe\u50cf\u5de6\u4e0a\u89d2\u7684\u6a2a\u7eb5\u5750\u6807\u503c\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u884c\u5217\u53f7\u5750\u6807\u4e2d\uff0c\uff080.0\uff0c0.0\uff09\u8868\u793a\u56fe\u50cf\u7684\u5de6\u4e0a\u89d2\u5750\u6807\uff0c\uff08\u50cf\u5143\u5bbd\u4e2a\u6570\uff0c\u50cf\u5143\u9ad8\u4e2a\u6570\uff09\u8868\u793a\u56fe\u50cf\u7684\u53f3\u4e0b\u89d2\u5750\u6807\u3002\u56fe\u50cf\u7684\u5de6\u4e0a\u89d2\u50cf\u5143\u7684\u4e2d\u5fc3\u70b9\u5750\u6807\u662f\uff080.5\uff0c0.5\uff09\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u5730\u9762\u63a7\u5236\u70b9\uff08GCPs\uff09<\/h4>\n\n\n\n<p>\u6570\u636e\u96c6\u4e2d\u6709\u53ef\u80fd\u5305\u62ec\u4e00\u7cfb\u5217\u7684\u5730\u9762\u63a7\u5236\u70b9\uff0c\u7528\u6765\u786e\u5b9a\u56fe\u50cf\u7684\u5730\u7406\u53c2\u8003\u5750\u6807\u3002\u6240\u6709\u7684\u63a7\u5236\u70b9\u90fd\u662f\u5728\u540c\u4e00\u4e2a\u5750\u6807\u7cfb\u7edf\u4e0b\u7684\uff08\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570GDALDataset\uff1aGetGCPProjection\uff08\uff09\u6765\u83b7\u53d6\u5730\u9762\u63a7\u5236\u70b9\u7684\u6295\u5f71\u4fe1\u606f\uff09\uff0c\u6bcf\u4e00\u4e2aGCP\uff08\u4f7f\u7528GDAL_GCP\u7ed3\u6784\u4f53\u6765\u8868\u793a\uff09\u5305\u62ec\u4e0b\u9762\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>typedef struct \nchar\r *pszId;\nchar\r *pszInfo;\r\ndouble  dfGCPPixel;\ndouble dfGCPLine;\ndouble  dfGCPX;\ndouble dfGCPY;\ndouble  dfGCPZ;\n}GDAL_GCP;<\/code><\/pre>\n\n\n\n<p>pszld\u5b57\u7b26\u4e32\u662f\u5f53\u524d\u6570\u636e\u96c6\u6240\u6709GCP\u70b9\u4e2d\u7684\u67d0\u4e00\u4e2aGCP\u70b9\u7684\u552f\u4e00\u6807\u8bc6\u7b26\uff08\u8fd9\u4e2a\u6807\u8bc6\u7b26\u901a\u5e38\u7528\u6570\u5b57\u8868\u793a\uff0c\u4f46\u4e5f\u4e0d\u662f\u6240\u6709\u7684\u60c5\u51b5\u4e0b\u90fd\u8fd9\u6837\uff09\u3002pszlnfo \u901a\u5e38\u662f\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u5b58\u50a8\u7528\u6237\u81ea\u5df1\u63cf\u8ff0\u8be5GCP\u7684\u6587\u672c\u4fe1\u606f\u3002\u8fd9\u4e2a\u5b57\u7b26\u4e32\u8fd8\u53ef\u4ee5\u5b58\u50a8GCP\u7684\u4e00\u4e9b\u72b6\u6001\u4fe1\u606f\uff0c\u6bd4\u5982GCP\u7684\u65f6\u95f4\u7b49\u3002<\/p>\n\n\n\n<p>\u5750\u6807\uff08Pixel\uff0cLine\uff09\u8868\u793a\u8be5\u70b9\u5728\u56fe\u50cf\u4e0a\u7684\u4f4d\u7f6e\uff0c\u5750\u6807\uff08X\uff0cY\uff0cZ\uff09\u8868\u793a\u8be5\u70b9\u5728\u5730\u7406\u53c2\u8003\u5750\u6807\u7cfb\u4e2d\u7684\u4f4d\u7f6e\uff0c\u901a\u5e38Z\u503c\u662f0\u3002<\/p>\n\n\n\n<p>GDAL\u6570\u636e\u6a21\u578b\u4e2d\u4e0d\u4f1a\u5b58\u50a8\u7528GCP\u70b9\u5bf9\u8fdb\u884c\u56fe\u50cf\u7ea0\u6b63\u7684\u8f6c\u6362\u65b9\u7a0b\uff0c\u8fd9\u4e2a\u8f6c\u6362\u65b9\u7a0b\u5e38\u5e38\u7531\u5e94\u7528\u7a0b\u5e8f\u8fdb\u884c\u5904\u7406\uff0c\u4e00\u822c\u4f7f\u75281\u6b21\u52305\u6b21\u591a\u9879\u5f0f\u8fdb\u884c\u8f6c\u6362\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5143\u6570\u636e\uff08Meta data\uff09<\/h3>\n\n\n\n<p>GDAL\u4e2d\u7684\u5143\u6570\u636e\u662f\u5bf9\u8be5\u6570\u636e\u7684\u4e00\u4e2a\u8f85\u52a9\u8bf4\u660e\uff0c\u5143\u6570\u636e\u7684\u683c\u5f0f\u662f\u7531\u4e00\u7cfb\u5217\u5f62\u5982\u201c\u540d\u79f0=\u503c\u201d\u7684\u5b57\u7b26\u4e32\u7ec4\u6210\u7684\u5217\u8868\u3002\u5143\u6570\u636e\u7684\u540d\u79f0\u7531\u7279\u5b9a\u7684\u7b26\u53f7\u6784\u6210\uff08\u4e0d\u80fd\u5305\u542b\u7a7a\u683c\u6216\u8005\u5176\u4ed6\u7279\u6b8a\u5b57\u7b26\uff09\uff0c\u503c\u53ef\u4ee5\u662f\u4efb\u610f\u957f\u5ea6\uff0c\u53ef\u4ee5\u5305\u62ec\u9664\u4e86\u7a7a\u503c\uff08ASCII\u76840\u503c\uff09\u7684\u4efb\u4f55\u5b57\u7b26\u3002<\/p>\n\n\n\n<p>\u6570\u636e\u96c6\u4e2d\u6700\u597d\u4e0d\u8981\u5b58\u50a8\u592a\u591a\u5143\u6570\u636e\uff0c\u5982\u679c\u5143\u6570\u636e\u5927\u5c0f\u8d85\u8fc7100KB\u5c31\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b50\u6570\u636e\u96c6\u57df\uff08Subdatasets Domain\uff09<\/h3>\n\n\n\n<p>\u5b50\u6570\u636e\u96c6\u57df\u662f\u542b\u6709\u5f88\u591a\u4e2a\u5b50\u6570\u636e\u96c6\u7684\u5b57\u7b26\u4e32\u5217\u8868\uff0c\u901a\u5e38\u7528\u6765\u63d0\u4f9b\u6307\u5411\u591a\u4e2a\u5f71\u50cf\uff08\u5982HDF \u548cNITF\u683c\u5f0f\uff09\u7684\u6307\u9488\uff0c\u8fd9\u4e9b\u5f71\u50cf\u5b58\u50a8\u5728\u540c\u4e00\u4e2a\u591a\u5f71\u50cf\u6587\u4ef6\u4e2d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u56fe\u50cf\u7ed3\u6784\u57df\uff08lmage_Structure Domain\uff09<\/h3>\n\n\n\n<p>\u5728\u9ed8\u8ba4\u57df\u7684\u5143\u6570\u636e\u4e0e\u5f71\u50cf\u6709\u5173\uff0c\u800c\u4e0e\u5f71\u50cf\u5728\u78c1\u76d8\u4e2d\u7684\u5b58\u50a8\u65b9\u5f0f\u6ca1\u6709\u7279\u5b9a\u5173\u7cfb\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u9700\u8981\u5c06\u6570\u636e\u96c6\u4e2d\u7684\u5f71\u50cf\u5b58\u50a8\u4e3a\u4e00\u79cd\u65b0\u683c\u5f0f\u7684\u65f6\u5019\uff0c\u8fd9\u4e9b\u5143\u6570\u636e\u4fe1\u606f\u53ef\u4ee5\u5f88\u65b9\u4fbf\u5730\u590d\u5236\u5230\u65b0\u7684\u56fe\u50cf\u4e2d\u3002\u6b64\u5916\u8fd8\u6709\u4e00\u4e9b\u4fe1\u606f\u662f\u548c\u56fe\u50cf\u7684\u683c\u5f0f\u53ca\u5b58\u50a8\u673a\u5236\u7d27\u5bc6\u5173\u8054\u7684\uff0c\u4e3a\u4e86\u9632\u6b62\u8fd9\u4e9b\u4fe1\u606f\u5728\u5199\u5165\u65b0\u56fe\u50cf\u7684\u65f6\u5019\u88ab\u590d\u5236\uff0c\u5c06\u5176\u5b58\u50a8\u5728\u4e00\u4e2a\u53eb IMAGE STRUCTURE \u7684\u7279\u6b8a\u57df\u4e2d\uff0c\u901a\u5e38\u8fd9\u91cc\u5b58\u50a8\u7684\u4e1c\u897f\u4e0d\u4f1a\u5199\u5165\u5230\u65b0\u7684\u56fe\u50cf\u4e2d\u53bb\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">RPC\u57df\uff08RPC Domain\uff09<\/h3>\n\n\n\n<p>RPC\u5143\u6570\u636e\u57df\u5b58\u50a8\u7684\u662f\u6709\u7406\u51fd\u6570\u6a21\u578b\u7684\u7cfb\u6570\uff0c\u8be5\u6a21\u578b\u53ef\u7528\u4e8e\u56fe\u50cf\u884c\u5217\u53f7\u4e0e\u7a7a\u95f4\u53c2\u8003\u4f4d\u7f6e\u95f4\u7684\u53d8\u6362\u3002<\/p>\n\n\n\n<p><a href=\"http:\/\/geotiff.maptools.org\/rpc_prop.html\" target=\"_blank\"  rel=\"nofollow\" >RPCs in GeoTIFF (maptools.org)<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">XML\u57df\uff08XML\uff1aDomains\uff09<\/h3>\n\n\n\n<p>XML 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Band\uff09<\/h3>\n\n\n\n<p>\u5728GDAL\u4e2d\u6805\u683c\u6ce2\u6bb5\u4f7f\u7528GDALRasterBand\u7c7b\u6765\u8868\u793a\u3002\u5b83\u8868\u793a\u4e00\u4e2a\u6805\u683c\u6ce2\u6bb5\u3001\u901a\u9053\u6216\u8005\u56fe\u5c42\u3002\u4e00\u4e2a\u6ce2\u6bb5\u4e0d\u4e00\u5b9a\u4ee3\u8868\u6574\u4e2a\u56fe\u50cf\uff0c\u6bd4\u5982\u4e00\u4e2a24bit\u7684RGB\u56fe\u50cf\u4e2d\u5c31\u542b\u6709\u4e09\u4e2a\u6ce2\u6bb5\uff0c\u5206\u522b\u662f\u7ea2\u6ce2\u6bb5\uff0c\u7eff\u6ce2\u6bb5\u548c\u84dd\u6ce2\u6bb5\u3002<\/p>\n\n\n\n<p>\u6805\u683c\u6ce2\u6bb5\u5305\u542b\u4e0b\u5217\u5c5e\u6027\uff1a<\/p>\n\n\n\n<p>\u25cf \u7528\u884c\u5217\u6570\u8868\u793a\u7684\u56fe\u50cf\u7684\u5bbd\u548c\u9ad8\u3002\u5982\u679c\u662f\u539f\u59cb\u6570\u636e\uff0c\u90a3\u4e48\u56fe\u50cf\u7684\u5bbd\u9ad8\u5c31\u548c\u6570\u636e\u96c6\u91cc\u9762\u7684\u4e00\u6837\u3002\u53e6\u5916\uff0cGDALRasterBand 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\u53ef\u9009\u7684\u504f\u79fb\u91cf\u548c\u7f29\u653e\u6bd4\u4f8b\uff0c\u7528\u6765\u5bf9\u56fe\u50cf\u7684\u50cf\u7d20\u503c\u8fdb\u884c\u53d8\u6362\uff0c\u6bd4\u5982\u53d8\u6362\u9ad8\u5ea6\u5230\u7c73\u7b49\u3002\u25cf \u53ef\u9009\u7684\u6805\u683c\u5355\u4f4d\u540d\u79f0\uff0c\u6bd4\u5982\u53ef\u4ee5\u7528\u6765\u8868\u793a\u9ad8\u7a0b\u6570\u636e\u7684\u7ebf\u6027\u5355\u4f4d\u3002<\/p>\n\n\n\n<p>\u25cf \u6ce2\u6bb5\u7684\u989c\u8272\u4fe1\u606f\uff0c\u662f\u4e0b\u9762\u503c\u4e2d\u7684\u67d0\u4e00\u4e2a\uff1a<\/p>\n\n\n\n<p>\u25a0 GCI_Undefined\uff1a\u9ed8\u8ba4\u503c\uff0c\u672a\u5b9a\u4e49\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_GrayIndex\uff1a\u7070\u5ea6\u56fe\u50cf\u3002<\/p>\n\n\n\n<p>\u25a0 GCIPaletteIndex\uff1a\u989c\u8272\u8868\u56fe\u50cf\u3002<\/p>\n\n\n\n<p>\u25a0 GCIRedBand\uff1aRGB\u6216RGBA\u56fe\u50cf\u7684R\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_GreenBand\uff1aRGB\u6216RGBA\u56fe\u50cf\u7684G\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_BlueBand\uff1aRGB\u6216RGBA\u56fe\u50cf\u7684B\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_AlphaBand\uff1aRGBA\u56fe\u50cf\u7684Alpha\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_HueBand\uff1aHLS\u56fe\u50cf\u7684\u8272\u8c03\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI SaturationBand\uff1aHLS\u56fe\u50cf\u7684\u9971\u548c\u5ea6\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCILightnessBand\uff1aHLS\u56fe\u50cf\u7684\u4eae\u5ea6\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_CyanBand\uff1aCMY\u6216CMYK\u56fe\u50cf\u7684\u9752\u8272\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_MagentaBand\uff1aCMY\u6216CMYK\u56fe\u50cf\u7684\u54c1\u7ea2\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI_YellowBand\uff1aCMY\u6216CMYK\u56fe\u50cf\u7684\u9ec4\u8272\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25a0 GCI BlackBand\uff1aCMYK\u56fe\u50cf\u7684\u9ed1\u8272\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u25cf \u989c\u8272\u8868\uff0c\u540e\u9762\u6709\u66f4\u8be6\u7ec6\u7684\u8bf4\u660e\u3002<\/p>\n\n\n\n<p>\u25cf \u5173\u4e8e\u91d1\u5b57\u5854\u662f\u5426\u53ef\u7528\u7684\u4fe1\u606f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u989c\u8272\u8868\uff08Color Table\uff09<\/h3>\n\n\n\n<p>\u989c\u8272\u8868\u7684\u5b9a\u4e49\u5982\u4e0b\uff0c\u4f7f\u7528C\u8bed\u8a00\u7684\u98ce\u683c\u5b9a\u4e49<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>typedef struct\n{\r\nshort c1;\r\nshort c2;\r\nshort c3;\r\nshort\r c4;\r\n} GDALColorEntry;<\/code><\/pre>\n\n\n\n<p>\u989c\u8272\u8868\u901a\u5e38\u662f\u989c\u8272\u8c03\u8272\u677f\u7684\u4e00\u4e2a\u503c\uff0cc1\/c2\/c3\/c4 \u56db\u4e2a\u503c\u7684\u4e0d\u540c\u542b\u4e49\u5bf9\u5e94\u4e0d\u540c\u7684\u8c03\u8272\u677f\uff0c\u5177\u4f53\u8868\u793a\u5982\u4e0b\u3002<\/p>\n\n\n\n<p>\u25cf GPI_Gray\uff1a\u4f7f\u7528cl\u8868\u793a\u7070\u5ea6\u503c\u3002<\/p>\n\n\n\n<p>\u25cf GPI_RGB\uff1ac1\u8868\u793a\u7ea2\u8272\uff0cc2\u8868\u793a\u7eff\u8272\uff0cc3\u8868\u793a\u84dd\u8272\uff0cc4\u8868\u793aalpha\u901a\u9053\u3002<\/p>\n\n\n\n<p>\u25cf GPI_CMYK\uff1acl\u8868\u793a\u9752\u8272\uff0cc2\u8868\u793a\u54c1\u7ea2\uff0cc3\u8868\u793a\u9ec4\u8272\uff0cc4\u8868\u793a\u9ed1\u8272\u3002<\/p>\n\n\n\n<p>\u25cf GPI_HLS\uff1ac1\u8868\u793a\u8272\u8c03\uff0cc2\u8868\u793a\u4eae\u5ea6\uff0cc3\u8868\u793a\u9971\u548c\u5ea6\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u7ed9\u6805\u683c\u5355\u5143\u8d4b\u4e88\u989c\u8272\uff0c\u6211\u4eec\u9700\u8981\u5c06\u50cf\u7d20\u503c\u4f5c\u4e3a\u4e0b\u6807\u4e0e\u989c\u8272\u8868\u5173\u8054\uff0c\u5c06\u989c\u8272\u8868\u4e2d\u7684\u989c\u8272\u8d4b\u7ed9\u5bf9\u5e94\u7684\u50cf\u7d20\uff0c\u6240\u4ee5\u989c\u8272\u8868\u4e2d\u7684\u503c\u603b\u662f\u4ece0\u5f00\u59cb\u9012\u589e\u7684\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5feb\u89c6\u56fe\uff08Overviews\uff09<\/h3>\n\n\n\n<p>\u4e00\u4e2a\u6ce2\u6bb5\u4e2d\u53ef\u80fd\u67090\u4e2a\u6216\u591a\u4e2a\u5feb\u89c6\u56fe\u3002\u6bcf\u4e2a\u5feb\u89c6\u56fe\u90fd\u662f\u4e00\u4e2a\u72ec\u7acb\u7684GDALRasterBand\uff0c\u5176\u5927\u5c0f\u4e0e\u4e0b\u5c42\u7684\u6805\u683c\u5927\u5c0f\u4e0d\u4e00\u6837\uff0c\u4f46\u662f\u5feb\u89c6\u56fe\u8868\u793a\u7684\u533a\u57df\u8303\u56f4\u4e0e\u6574\u4e2a\u56fe\u50cf\u662f\u4e00\u81f4\u7684\u3002<\/p>\n\n\n\n<p>\u5feb\u89c6\u56fe\uff0c\u662f\u901a\u8fc7\u5bf9\u539f\u59cb\u56fe\u50cf\u8fdb\u884c\u964d\u91c7\u6837\u5f97\u5230\u7684\uff0c\u7528\u4e8e\u56fe\u50cf\u7684\u5feb\u901f\u663e\u793a\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6ce2\u6bb5\u7c7b\u4e2d\u7684HasArbitraryOverviews\u5c5e\u6027\u6765\u5224\u65ad\u662f\u5426\u6709\u5feb\u89c6\u56fe\uff0c\u5982\u679c\u8fd4\u56deTRUE\u8868\u793a\u6709\uff0c\u5c31\u53ef\u4ee5\u8bfb\u53d6\u4efb\u4f55\u5206\u8fa8\u7387\u7684\u5feb\u89c6\u56fe\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">GDAL\u5e38\u7528\u7c7b<\/h2>\n\n\n\n<p>\u5728GDAL\u4e2d\uff0c\u6240\u6709\u7684\u7c7b\u90fd\u662f\u4eceGDALMajorObject\u6d3e\u751f\u51fa\u6765\u7684\uff0c\u5e38\u7528\u7684\u7c7b\u7ee7\u627f\u5173\u7cfb\u56fe\u5982\u56fe\u6240\u793a\u3002\u4ece GDALMajorObject \u7ee7\u627f\u7684\u7c7b\u6709 GDALDataset\u3001GDALDriver\u3001GDALDriverManager \u548cGDALRasterBand\uff0c\u5176\u4e2dGDALDataset\u662f\u76f8\u5173\u7684\u6805\u683c\u6ce2\u6bb5\u7684\u96c6\u5408\uff0c\u8fd9\u4e9b\u6ce2\u6bb5\u4e00\u822c\u6765\u81ea\u540c\u4e00\u4e2a\u6587\u4ef6\uff0c\u4e00\u4e2adataset\u901a\u5e38\u5305\u62ec\u4e00\u4e2a\u6216\u591a\u4e2a\u6805\u683c\u6ce2\u6bb5\uff1bGDALDriver\u662f\u683c\u5f0f\u5316\u7684\u9a71\u52a8\uff0c\u8fd9\u4e2a\u7c7b\u7684\u6bcf\u4e2a\u5b9e\u4f8b\u90fd\u652f\u6301\u4e00\u79cd\u683c\u5f0f\uff0c\u5e76\u4e14\u7ba1\u7406\u8be5\u683c\u5f0f\u7684\u76f8\u5173\u4fe1\u606f\uff1bGDALDriverManager\u662f\u7ba1\u7406\u6587\u4ef6\u683c\u5f0f\u9a71\u52a8\u7684\u6ce8\u518c\u4fe1\u606f\u7684\u7c7b\uff0c\u53ef\u4ee5\u4f7f\u7528GetGDALDriverManager()\u6765\u83b7\u53d6\u6240\u6709\u9a71\u52a8\u4fe1\u606f\uff0c\u5373\u9a71\u52a8\u5217\u8868\uff1bGDALRasterBand\u7528\u4e8e\u5904\u7406\u4e00\u4e2a\u5355\u6ce2\u6bb5\u6216\u8005\u5355\u901a\u9053\u7684\u6805\u683c\u6570\u636e\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"702\" height=\"267\" src=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/03\/image-3.png\" alt=\"\" class=\"wp-image-800\" srcset=\"https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/03\/image-3.png 702w, https:\/\/www.gislxz.com\/wp-content\/uploads\/2023\/03\/image-3-300x114.png 300w\" sizes=\"auto, (max-width: 702px) 100vw, 702px\" \/><\/figure><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>GDALDriveManager<\/li><li>GDALDriver<\/li><li>GDALDataset<\/li><li>GDALRasterBand<\/li><\/ul>\n\n\n\n<p>GDAL Raster\u76f8\u5173\u7684API\uff0c\u61d2\u5f97\u590d\u5236\u4e86<\/p>\n\n\n\n<p><a href=\"https:\/\/gdal.org\/api\/index.html#raster-api\" target=\"_blank\"  rel=\"nofollow\" >API \u2014 GDAL documentation<\/a><\/p>\n\n\n\n<p>\u66f4\u65b0\u4e2d\u3002\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>GDAL\u5e93\u7684\u4e00\u4e9b\u8bf4\u660e\uff08\u7eaf\u7406\u8bba\uff09<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[25],"tags":[],"class_list":["post-797","post","type-post","status-publish","format-standard","hentry","category-gis"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts\/797","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/comments?post=797"}],"version-history":[{"count":2,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts\/797\/revisions"}],"predecessor-version":[{"id":802,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/posts\/797\/revisions\/802"}],"wp:attachment":[{"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/media?parent=797"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/categories?post=797"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gislxz.com\/index.php\/wp-json\/wp\/v2\/tags?post=797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}