ArcGIS Tutorial: How to merge a dem under ArcGIS

If in 9.0, 9.2 is convenient. Select a Dem directly in Arccatlog and then select Load Data (mosaic in Toolbox under raster) from the right-click menu to merge with the other Dem. Ok

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Using ArcGIS to resample a dem

1.toolbox Raster under Resample tool

2. Parameter Setting reference Help

3. Cellsize=5 before sampling

4. After sampling cellsize=10 (twice times the resolution magnification)/twice times the length and width, the area is 2x2.

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How do I stitch a raster image in TIFF format under ArcGIS? To vectorize a topographic map, after scanning for a TIFF format?

A, can use Toolbox-//data managerment tools-//raster under the mosaic splicing raster image;

B, can also be vectorized and then calibrated, using data managerment tools append mosaic vector image//(after scanning, there is no coordinates oh. This should be noted)

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Second, the operation steps of cutting tin according to the specified boundary.

Process description

1, if you want to use the specified boundary to cut the tin, then when you build the tin, whether you specify mask or specify extent, will not achieve the desired effect.

2. Specifying a polygon polygon as a soft clip to crop a tin when building a tin can be a good implementation of the requirements.

Iii. A brief description of how to crop a tin with a polygon layer in a three-dimensional analysis module

Process description

1. Add tin layers and polygon layers in ArcMap or arcscene.

2. Select 3D analyst>create/modify tin > Add Features to Tin.

3. Select the tin layer as the input tin.

4. Select the polygon layer.

5. Make the following settings for the selected layer:

Height Source:

Triangluate As:hard Clip

Tag Value field:

6. Output the modifications to a new tin layer.

7. Click OK.

Iv. where are the differences between hard lines and cords in tin?

Answer

The Createtin command uses line feature classes to allow you to select both hard and soft lines, which play the same role in the generation of tin patterns.

Therefore, the difference between the two lines is only reflected when using multi-explicit interpolation to analyze the tin surface, and the tools that support polynomial interpolation are:

Tinlattice

Tincontour

Tinspot

SURFACE

Hard lines can force the surface to break smoothly, such as when performing polynomial smoothing. And the cords do not break the surface smoothly.

How to use SHP files to cut dem and image images under ArcGIS

ArcGIS9 software, ArcToolbox-->spatial analysis tools-->extraction--->extract by Mask (remember: Spatial analysis extensions must be installed; Topographic map shp file needs to be a polygon; the spatial reference should be the same as your DEM, and if not, use project to convert it first. )---OK

(The situation below is not verified!)

The clipping of the raster data can be done using the raster caculation in the spatial analysis tool in ArcMap to first select the range to be clipped in the option in Spatial analyzer (which can be used as a mask), and the +0 operation in the calculation. You can get the raster image of the range you want.

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Raster: Raster Data

DEM: Digital elevation model (ASCII)

Image: Image

Grid:grid is a raster data type that is proprietary to ArcGIS.

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How to crop and cut vector and raster data in ArcGIS

1, cut the vector data: arctoolbox, spatial tool > Extract>clip

Select the cropped layer in the Inputfeatures and select the Crop shape in the Clipfeatures

2, using the rectangle to crop the raster data: arctoolbox, Data management>raster>clip

Select the clipped raster data in the Inputraster and set the four vertices of the rectangle.

3. A variety of raster data extraction methods are available in spatial analyst Tools: Arctoolbox, spatial analyst Tools>extraction includes extract values to point, extract from attributes, extract by Circle, extract with polygon , using mask extraction, extracting with points, extracting with rectangle, and so on, the mask extraction function allows us to obtain the required raster data through the irregular boundary.

ArcGIS Tutorial: How to merge a dem under ArcGIS