private static Layer loadLayerData() {
String rootPath = "D:\\Temp\\chunmapData";
String parameters = "1267327509866";
Envelope subEnvelop = new Envelope(92.37175137842411, 31.01897163866643,
108.8716402641172, 44.2188827472209);
GridDataFactory df = new GridDataFactory(rootPath, parameters,
subEnvelop, 500, 400);
Layer layer = df.createLayer();