Contour map production method [Photos]

First, the preparation

Hardware: A Pentium IV-class computer with no less than 512M of memory and no less than 10G of hard disk space

software:

* FlashGet 1.65 or higher for downloading huge data files * Global Mapper 6.07 or later for compositing data and generating contour lines * Photoshop 6.0 or higher for editing maps

data:

* National Basic Geographic Information

Http://nfgis.nsdi.gov.cn/nfgis/chinese/c_xz.htm

Including China's administrative territory, the main road river

* China geographical name data china.name includes tens of thousands of township-level geographical names and coordinates * elevation data SRTM3 global 3D terrain data * satellite photos ETM + remote sensing photos * GPS data, if any, can be synthesized on the map

Second, download the data

(This tutorial takes "Huangshan" as an example)

To

Http://glcfapp.umiacs.umd.edu:8080/esdi/search.jsp

Check "ETM+" and "SRTM, Degree Tiles" and select "Place" to locate.

Enter the pinyin name “huangshan” of Huangshan in the “Place” column and press Enter. After the page refreshes, “2 image(s)” will appear for the data matching the coordinates of the area. Click “Preview & Download” to preview.

That's right. It is a satellite photo “ETM+” and an elevation data “SRTM” that we want. You can see the thumbnail by clicking [ID] and click “Download” to download.

Download page may also include other data, anyway, pick the largest file size, use FlashGet download right.

We thus obtained two data files:

P120r039_7p20001103_z50_nn80.tif.gz 115292466 bytes (115M

SRTM_u03_n029e118.tif.gz 2230019bytes (2.2M

Third, the combined data

First open the ETM+ file, that is, "p120r039_7p20001103_z50_nn80.tif.gz", and then press Alt-C to enter the layer adjustment, modify the "Option" of the layer, brighten the brightness to the left, and set the Blend to "Hard Light" .

Then open the national basic geographic information file and superimpose roads, administrative areas, and rivers. Then zoom in on the required area to the entire window.