互联网地图栅格比例尺（3857,4326）

互联网地图栅格切片比例尺

常用的栅格切片坐标系为3857、4326。

由于不同平台切片dpi的差别，每级对应的比例尺也会有少许差异。不同的平台最终生成的切片，可以叠加在一起。

1.3857坐标系切片

该类普遍都存在偏移，在形变方面，采用等角的方式，全球由一张256*256像素的切片向下不断分割，形成多层级金字塔切片架构。

（1）arcgis server 中对应的切片规则如下：【dpi为96，与90，90.71428571427429，比例尺方面稍微有些差别】

{"currentVersion":10.61,"serviceDescription":"","mapName":"Layers","description":"","copyrightText":"","supportsDynamicLayers":true,"layers":[{"id":0,"name":"101-shijie_region","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0}],"tables":[],"spatialReference":{"wkid":102100,"latestWkid":3857},"singleFusedMapCache":true,"tileInfo":{"rows":256,"cols":256,"dpi":96,"format":"PNG","compressionQuality":0,"origin":{"x":-2.0037508342787E7,"y":2.0037508342787E7},"spatialReference":{"wkid":102100,"latestWkid":3857},"lods":[
{"level":0,"resolution":156543.03392800014,"scale":5.91657527591555E8},
{"level":1,"resolution":78271.51696399994,"scale":2.95828763795777E8},
{"level":2,"resolution":39135.75848200009,"scale":1.47914381897889E8},
{"level":3,"resolution":19567.87924099992,"scale":7.3957190948944E7},
{"level":4,"resolution":9783.93962049996,"scale":3.6978595474472E7},
{"level":5,"resolution":4891.96981024998,"scale":1.8489297737236E7},
{"level":6,"resolution":2445.98490512499,"scale":9244648.868618},
{"level":7,"resolution":1222.992452562495,"scale":4622324.434309},
{"level":8,"resolution":611.4962262813797,"scale":2311162.217155},
{"level":9,"resolution":305.74811314055756,"scale":1155581.108577},
{"level":10,"resolution":152.87405657041106,"scale":577790.554289},
{"level":11,"resolution":76.43702828507324,"scale":288895.277144},
{"level":12,"resolution":38.21851414253662,"scale":144447.638572},
{"level":13,"resolution":19.10925707126831,"scale":72223.819286},
{"level":14,"resolution":9.554628535634155,"scale":36111.909643},
{"level":15,"resolution":4.77731426794937,"scale":18055.954822},
{"level":16,"resolution":2.388657133974685,"scale":9027.977411},
{"level":17,"resolution":1.1943285668550503,"scale":4513.988705},
{"level":18,"resolution":0.5971642835598172,"scale":2256.994353},
{"level":19,"resolution":0.29858214164761665,"scale":1128.497176},
{"level":20,"resolution":0.14929107082380833,"scale":564.248588},
{"level":21,"resolution":0.07464553541190416,"scale":282.124294},
{"level":22,"resolution":0.03732276770595208,"scale":141.062147},
{"level":23,"resolution":0.01866138385297604,"scale":70.5310735}]},
"initialExtent":{"xmin":1.2440891203098156E7,"ymin":3378130.323403754,"xmax":1.3200146802202465E7,"ymax":3689109.7900786763,"spatialReference":{"wkid":102100,"latestWkid":3857}},"fullExtent":{"xmin":1.2656643609424848E7,"ymin":3499666.577932451,"xmax":1.2810124132841675E7,"ymax":3680022.8146885675,"spatialReference":{"wkid":102100,"latestWkid":3857}},"minScale":5.91657527591555E8,"maxScale":70.5310735,"units":"esriMeters","supportedImageFormatTypes":"PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP","documentInfo":{"Title":"","Author":"","Comments":"","Subject":"","Category":"","AntialiasingMode":"None","TextAntialiasingMode":"Force","Keywords":""},"capabilities":"Map,Query,Data","supportedQueryFormats":"JSON, AMF, geoJSON","exportTilesAllowed":false,"supportsDatumTransformation":true,"maxRecordCount":1000,"maxImageHeight":4096,"maxImageWidth":4096,"supportedExtensions":"KmlServer"}

（2）geoserver 3857切片规则

2.4326坐标系

该类坐标系的地图切片互联网上比较少见，主要是google的无偏移影像采用此类坐标系，也是下载最多的切片数据，用于在局域网中与自由数据进行叠加切片使用。

既然要与自由数据叠加，那就必须要理清此类影像切片的规则

（1）以arcgis server切片为例，切片规则如下：

{"currentVersion":10.61,"serviceDescription":"","mapName":"Layers","description":"","copyrightText":"","supportsDynamicLayers":true,"layers":[{"id":0,"name":"301-dishi_point","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":1,"name":"302-quxian_point","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":2,"name":"203-shiqugandao_polyline","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":3,"name":"202-shengdao_polyline","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":4,"name":"201-guodao_polyline","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":5,"name":"200-gaosugonglu_polyline","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":6,"name":"210-tielu_polyline","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":7,"name":"001-heliu_region","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":8,"name":"102-quxian_region","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0},{"id":9,"name":"101-shijie_region","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":null,"minScale":0,"maxScale":0}],"tables":[],"spatialReference":{"wkid":4326,"latestWkid":4326},"singleFusedMapCache":true,"tileInfo":{"rows":256,"cols":256,"dpi":96,"format":"PNG32","compressionQuality":0,"origin":{"x":-180,"y":90},"spatialReference":{"wkid":4326,"latestWkid":4326},
"lods":[
{"level":0,"resolution":0.703125013115789,"scale":2.95497598570834E8},
{"level":1,"resolution":0.3515625065578945,"scale":1.47748799285417E8},
{"level":2,"resolution":0.17578125327894775,"scale":7.38743996427087E7},
{"level":3,"resolution":0.08789062663947399,"scale":3.69371998213544E7},
{"level":4,"resolution":0.043945313319736994,"scale":1.84685999106772E7},
{"level":5,"resolution":0.021972656659868472,"scale":9234299.95533859},
{"level":6,"resolution":0.010986328329934226,"scale":4617149.97766929},
{"level":7,"resolution":0.005493164164967124,"scale":2308574.98883465},
{"level":8,"resolution":0.0027465820824835504,"scale":1154287.49441732},
{"level":9,"resolution":0.0013732910412417797,"scale":577143.747208662},
{"level":10,"resolution":6.866455206208899E-4,"scale":288571.873604331},
{"level":11,"resolution":3.433227603104438E-4,"scale":144285.936802165},
{"level":12,"resolution":1.716613801552224E-4,"scale":72142.9684010827},
{"level":13,"resolution":8.583069007761132E-5,"scale":36071.4842005414},
{"level":14,"resolution":4.291534503880566E-5,"scale":18035.7421002707},
{"level":15,"resolution":2.1457672519402802E-5,"scale":9017.87105013534}]},
"initialExtent":{"xmin":113.48817079442448,"ymin":30.579962791199996,"xmax":115.22279786767477,"ymax":31.116769194115314,"spatialReference":{"wkid":4326,"latestWkid":4326}},"fullExtent":{"xmin":-180,"ymin":-90,"xmax":180,"ymax":90,"spatialReference":{"wkid":4326,"latestWkid":4326}},"minScale":2.95497598570834E8,"maxScale":9017.87105013534,"units":"esriDecimalDegrees","supportedImageFormatTypes":"PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP","documentInfo":{"Title":"","Author":"","Comments":"","Subject":"","Category":"","AntialiasingMode":"None","TextAntialiasingMode":"Force","Keywords":""},"capabilities":"Map,Query,Data","supportedQueryFormats":"JSON, AMF, geoJSON","exportTilesAllowed":false,"supportsDatumTransformation":true,"maxRecordCount":1000,"maxImageHeight":4096,"maxImageWidth":4096,"supportedExtensions":"KmlServer"}

（2）以geoserver WMTS切片为例，切片规则如下:

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