Originally Posted by sailias
Bout time I learn how to do this......tutorial pls???
Best and kind regards
Will teach me not to open my big mouth...
Here we go
1 - A python interpreter
(The window 3.3.2 installer makes it very easy)
Get it and install it.
(Python 3.3.2 Windows x86 MSI Installer
for 32 bit computers
Python 3.3.2 Windows X86-64 MSI Installe
r for 64 bit computers)
2 - The following zipped folder that contains
-the imgkap app
- my very verbose English
python script that activates imgkap to create a kap chartlet from a georeferenced chart image (most usual formats are supported; jpg, tif, bmp, gif etc...)
Free - Envoyez vos documents
Bundled with it is a jpg chart image sample (French Brittany NW coast), and a text file with the necessary information (in the right order) that you will be prompted to enter when launching the script. That should start you right away...
This folder can be put anywhere convenient.
Start the script by double clicking on it and type in the requested info...
You make your own chartlet, you need
- A chart image
- the pixel size of the image
- the X/Y pixel positions of two reference points, one near the top left corner of the chart (not necessarily the top left corner itself), the second one near the bottom right corner (ditto), and the precise latitude/longitude of these two ref points.
(I use Xnview, where the status bar gives you the pixel dimension of the chart image and the coordinates of the cursor when you place it on the reference points; see pic)
XnView Software · Software for reading, organizing and processing images
Reference points: Very often, the lat/long of two or more corners are printed on charts. You can also use the lat/long grid marks to select reference points.
If making charts from internet
map servers, you may place markers that come with their lat/long information, jot the values down, then make a screen
The lat/long values must be in degree and decimal minutes