TACKLEFEVER

Sorry, maybe I didn't have enough coffee this morning...
The world file format looks correct to me. Am I missing something? The default extension with gdal_translate is 'wld'....so that is why I even tried renaming to pgw suffix. Still IMC doesn't process.

j@MacBook-Pro TestMaps % gdal_translate -of PNG -co WORLDFILE=YES NorthCoast.tif NorthCoast.png
Input file size is 7167, 13750
0...10...20...30...40...50...60...70...80...90...100 - done.

j@MacBook-Pro TestMaps % cat NorthCoast.wld
22.7559822520
0.0000000000
0.0000000000
-22.7559822520
-13929033.6805088725
5910014.9399412917

Thanks for the reply.

I'll try the GeoTiff with a Worldfile.

I tried PNG with a worldfile (as you can create one with gdal_translate)...but IMC still didn't like it for some reason.

example: "gdal_translate -of png -co WORLDFILE=YES NorthCoast.tif NorthCoast.png"

#ls  NorthCoast.*
NorthCoast.png      NorthCoast.png.aux.xml   NorthCoast.tif      NorthCoast.wld


So the Worldfile (.wld) gets created with the same prefix as the png file and I place that in the same directory for IMC processing.  I thought that is all that was needed for Raster processing in IMC...but maybe I'm missing something. I even tried renaming the world file to .pgw to be more standard; and still IMC doesn't process.

If I convert to KML, then it works.

-J

@fjordfischer

Maybe I'm doing something wrong, but IMC will not process my GeoTiff files. I have to convert them to KML...which is easy enough. I just use gdal_translate
'gdal_translate -of KMLSUPEROVERLAY MyTiffImage.tif   MyKMLFiles/MyKML.kml'

So if there is a way to get a native GeoTiff image processed by IMC that would be great...similar to transport the files around.

On another note, I need to get my AT file size down on a new project. 25MB of KML files turned into 32GB of AT Files with Zoom level 1 to 16.  Got to figure out why its so big.

-J

So are you saying I don't have to convert the GeoTiff's to KML files for IMC to process them?

Have I been doing that extra step for no reason?


I tried to process some PNG files with the beta version of IMC but it didn't do anything. It says it processed them...but nothing in the working directory. I was trying PNG for compression reasons....easier to work with size wise.

Hi Folks,

I just joined the group. Been using IMC for a while and I like to create custom charts from various sources. Typically, I have been getting PDF maps of the ocean floor from various organizations that has bottom composition. I then load them into QGIS as a raster image after loading into the Georeferencing tool and creating lots of GCP points to convert it into a GeoTiff.

Then when I get all my layers I want I like to export it as an image with 1200dpi.

If it is only one single GeoTiff that I converted, I've used the 'Raster->Conversion->Translate' functions to convert to KML format.


My question to those that have experience; what method of exporting layers have you found the best for importing into IMC?
When I go to export to image, and then have to specify a canvas size and then the DPI...I notice that my font size of my labels will be different and sometimes everything gets skewed.
But if I have a single layer that I save as a GeoTiff and then go through the conversion utility to convert to KML, it seems to keep all my aspect ratios, and detail correctly.

A couple of years ago, I created a how-to video on doing these conversions of maps and then how to process in IMC. Hopefully this is useful for others that are starting.
https://youtu.be/3t7rL8aBw3c?feature=shared

In the meantime, if you have some suggestions on better ways to export from QGIS for IMC, please let me know.

Thank you.

Jeremy