使用 MapXtreme2008 导入 Ascii/Grid 文件？

Question

我们正在考虑从 MapX4.5/Vertical Mapper3 升级到 MapXtreme2008（60 天试用版）。我们无法使用 MapXtreme 导入 Ascii/Grid 文件。我们已尝试在 MapXtreme 论坛上发帖，但到目前为止尚未得到答复。谢谢。

http://en.wikipedia.org/wiki/ESRI_grid

Answer 1

如果单元格宽度太长，则使用插值器从点创建网格会花费很多时间。
但是，您可以指定哪个插值器，如何聚合点。
这里是一个代码示例：

//outTable and usaCapsTable is given

// Create the Interpolator
InverseDistanceWeightedInterpolator idw = new InverseDistanceWeightedInterpolator();
// Set the values
idw.SearchRadius = 100; // in pixels
idw.Exponent = 2;
idw.MinPoints = 1;
idw.MaxPoints = 1000;

// Create a GridCreator and pass in the table to use for input, the column holding the data, the interpolator. 
MapInfo.Raster.GridCreatorFromFeatures cg = new GridCreatorFromFeatures(usaCapsTable, "Pop_1990", idw, outTable);
cg.CellWidth = new Distance(12.9, DistanceUnit.Mile);
Inflection[] infl = new Inflection[5];
infl[0] = new Inflection(8000, Color.Blue);
infl[1] = new Inflection(121000, Color.Aquamarine);
infl[2] = new Inflection(199000, Color.Green);
infl[3] = new Inflection(298000, Color.Yellow);
infl[4] = new Inflection(980000, Color.Red);

// Create a grid Style to use and pass in the onflection points.
cg.GridStyle = new GridStyle(infl, true, Color.White, true);

// Now check if there is a current selection. If yes then use the objects to clip the grid against.
if ((MapInfo.Engine.Session.Current.Selections.DefaultSelection.Count > 0) &&
    MapInfo.Engine.Session.Current.Selections.DefaultSelection[0].Count > 0)
{
    MapInfo.FeatureProcessing.FeatureProcessor fp = new MapInfo.FeatureProcessing.FeatureProcessor();
    Feature clip = fp.Combine(MapInfo.Engine.Session.Current.Selections.DefaultSelection[0]);
    cg.ClippingGeometry = clip.Geometry;
}
else
{
    cg.ClippingGeometry = null;
}

// Create the grid file.
cg.CreateGrid();

希望这有帮助
迈拉