How to georeference in MATLAB?

17 views (last 30 days)
Ali Almakhmari
Ali Almakhmari on 11 Sep 2022
Answered: KSSV on 15 Sep 2022
So guys I have a map as given in the google drive link (too big to attach here): https://drive.google.com/file/d/1XzeM835pHCJQ3hoi9uJgLSOLIe04J-k6/view?usp=sharing. I want to georeference this map's picture in MATLAB but according to the geotiffwrite command I need a ".tfw" file to do this...which I don't. However, I created this image and I know every coordinate of each pixel. On the horziontal axis of the image, its the longitude, and it stretches from -180 degrees to 180 degrees (left to right). And on the vertical axis of the image, its the latitude, and it stretches from 90 degrees to -90 degrees (up to down). The resolution of the picture is 3601 by 7201. And it follows those two equations:
P_vertical = -20*(La-90) + 1
P_horziontal = 20(Lo+180) + 1
For example, if you want to know the best pixel that corresponds to the coordinate Latitude = 0 (La = 0) and Longitude = 0 (Lo = 0), then use the previous equations and you will see that the pixel on the image that corresponds to that coordinare is (horziontal, vertical) = (3601, 1801). The map has a very simple transformation as you can see, and georeferencing it shouldn't be diffcuilt. But I just don't know how. Any help is appreciated.

Accepted Answer

KSSV
KSSV on 15 Sep 2022
file = 'truemap_automatedEditedz.tif' ;
[A,R] = readgeoraster(file) ;
image([-180 180], [90 -90],A)

More Answers (0)

Categories

Find more on File Import and Export in Help Center and File Exchange

Products


Release

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by