Mutual projection transformation between cgcs2000 coordinate system and WGS84

How can I change the downloaded image to the country's 2000 coordinates?

Note:To convert a projection to a cgcs2000 coordinate system, you need to download a non-offset satellite image for conversion. an offset conversion will cause the converted satellite image to be distorted, the coordinates are incorrect, and registration fails.

Step 1: select a map source without offset to download the satellite image you need.

Step 2: select the toolbar on the right of the bigemap software and select projection conversion, as shown in:

2.1 selection instructions:

1. source file: select the downloaded satellite image file (Files suffixed with tiff in the download directory)

2. Source coordinate system: the projection Coordinate System of the open source file (automatically read, do not enter it manually)

3. output file: select the path and file name of the file to be converted.

4. Target coordinate system: select the target coordinate system to be converted to, for example:

More options are selected, as shown in:

1: select-cgcs2000 2: Select Region 3: select the ID corresponding to the index band (which can be manually modified by default)

Select the corresponding index band or central Meridian (see: how to select the index band ?), Click OK]

5. re-sampling algorithm: For projection conversion, the pixels of the images need to be re-arranged. The efficiency of each algorithm is different. Generally, [cubic convolution sampling] is selected to achieve the best effect. For example:

6. Specify the transformation parameter. If you do not know the parameter, you do not need to fill in the information here. If you have √, the information is as follows:

This parameter is a "three parameters" or "seven parameters" and is a national confidentiality parameter. You need to sign a confidentiality agreement with the local Surveying and Mapping Department or the Land and Resources Department for purchase in the name of the organization, this parameter varies across regions and is strictly confidential. Do not circulate it as needed.

Step 3: Click OK to start conversion, for example:

Step 4: Open the Output Folder you just selected, which contains the converted satellite image.

Step 5: If you need to set up the Vector file that you already have, see [bigemap without offset image overlapping Registration]

 

Mutual projection transformation between cgcs2000 coordinate system and WGS84