QMap - Geodetic Control Point ( GCP ) input and management
To stitch multiple images, especially remote sensing images, it is necessary to use the method of geometric precision correction. Therefore, selecting the geographic location and coordinates, and saving them together with annotations and notes is the first step. Then, the selected coordinates are unified and saved as one or a group of files, which can be reused in subsequent specific corrections to improve efficiency.
Now according to the software function interface, the introduction is as follows:
Click the "Open map" button to pop up the browser and display the Google map. If necessary, consult other types of maps separately.
2. Find geolocation and coordinates
Find the characteristic point on the map, get the corresponding latitude and longitude or plane coordinate value, and enter it in the x and y edit boxes of the geodetic coordinate. In the "Logo" box, fill in the brief information of the coordinate, such as abbreviations of road names, intersections, etc. In the "Notes" box, fill in the geographic name, feature information and other relevant information.
3. Determine the coordinate type
The default is latitude and longitude, and plane coordinates can also be selected. In the case of latitude and longitude, you can double-check the point location on Google Maps by clicking the "Check" button.
4. Add
Click the "Add" button to add the selected coordinate point and corresponding information to the list box. Entries in the list can be edited, moved up and down, and the values of the coordinates xy can be swapped.
5. Save and Load
Click the "Save" button to save the data in the list to the file. Click the "Load" button to restore the coordinate data to the list.
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