[bug] 修复ol webmap 京津WMTS偏移问题

review yuzhiy

Author: MyShallowTime

src/openlayers/mapping/WebMap.js

@@ -1518,7 +1518,7 @@ export class WebMap extends Observable {
     getReslutionsFromScales(scales, dpi, unit, datumAxis) {
         unit = (unit && unit.toLowerCase()) || 'degrees';
         dpi = dpi || dpiConfig.iServerWMTS;
-        datumAxis = datumAxis || 6370997;
+        datumAxis = datumAxis || 6378137;
         let res = [],
             matrixIds = [];
         //给个默认的