OpenCPN 4.6.1 - Weather routing and Land Detection not working

[FredVeroMakani]

Hi,

I might be doing something wrong but it seems i can't get the "Land detect" feature to work in weather routing with Opencpn 4.6.1 (tried 4.8, but Weather routing computing crashes Opencpn, so i revert back to 4.6.1)
It is a bit of a problem as I m in the Med and doing coastal sailing...
Is there any settings or specific "land chart" to install first ?

As you can see the Magenta computed track is obvisouly a "bit" in land... see pic



Thanks

[seandepagnier]

Weather routing uses the gshhs base map for landfall detection. If you built from source you may not have it at all, and the basemap distributed with opencpn is very low resolution and won't work well.


If you disable all charts, you should see this base map in blue and green. It is recommended you update to the highest resolution gshhs map for weather routing.

[bcn]

Here the comparison (Background chart and ES200303):

[FredVeroMakani]

Thanks,
Where is the gshhs file located within OCPN installation folder?
I have been looking at updated gshhs file but it seems that only the NOAA is providing some under a ghssG format. (there are three type of files)
www.ngdc.noaa.gov/mgg/shorelines/data/gshhg/latest/.
Could you please be a bit more specific?
Thanks a lot.

[FredVeroMakani]

Thanks, found the Hi-Res version of the file on Opencpn.org and it seems to working fine now !
Thanks for your help !

[rgleason]

https://opencpn.org/wiki/dokuwiki/do...hart_sources&s[]=gshhs

Search the manual wiki with gshhs

[hasse_A]

I am puzzled by the fact I can not do weather routing.
I have checked the box "Detect Land" under options.
I get the error : "Polar: Land: Failed"

I have read the wiki stated by rgleason and done the following :
In OpenCPN Chart downloader I downloaded all basemaps gshhg and added
it to the Charts directory.

I still get the same resolution of the basemap regardless if I include the gshhg directory or not.

Running OpenCPN 4.8.8 and weather routing 1.12.

/Hans

[hasse_A]

Originally Posted by rgleason

https://opencpn.org/wiki/dokuwiki/do...hart_sources&s[]=gshhs

Search the manual wiki with gshhs

Why is the link called gshhs when the directory name is gshhg ?

[hasse_A]

Originally Posted by hasse_A

Why is the link called gshhs when the directory name is gshhg ?

Ok, obviously there are 2 different base maps.
When I go to charts download I get the gshhg version, not gshhs.
Can the reason be that gshhg does not work with OCPN ?
If so why do the add chart point to gshhg ?

/Hans

[hasse_A]

Originally Posted by hasse_A

.
Can the reason be that gshhg does not work with OCPN ?
/Hans

gshhs gives the same error.

/Hans

[bcn]

Originally Posted by hasse_A

In OpenCPN Chart downloader I downloaded all basemaps gshhg and added
it to the Charts directory.
/Hans

Hans,

here is something fishy. When using the chart downloader you shall not need to add directories manually.
But you can.

How does the chart directory list look like?

And what is the content of your directory with the GSSHG files?

Hubert

[hasse_A]

Originally Posted by bcn

How does the chart directory list look like?

And what is the content of your directory with the GSSHG files?

Hubert

At the moment the chart directory list only contains one line pointing to the GSSHG directory. You are saying it does not have to be there ?
How can you determine if the high resolution base files affect the OpenCPN charts ?

/Hans

[bcn]

In the log file you shall see if the chart directory contains the GSSHG is getting included.

You can try to delete your entry of GSHHG from the chart directory list and then include it again. "Apply". This shall provoke a rescan of the chart data base and the inclusion of the newly added directory.

The base map which comes with OpenCPN is found at the application itself.

[nohal]

Hans...
GSHHG is just a newer, renamed version of GSHHS.
The newest you can get is the one you download through the chart downloader plugin. It should just work unless you try pretty hard to break it...
You should see a correct key like this in your config file once the basemaps you downloaded were correctly detected:

BasemapDir=/Users/nohal/Documents/Charts/GSHHG/

And after the next start something like this should appear in your logfile:

13:23:48 -03: Background world map loaded from GSHHS datafiles found in: /Users/nohal/Documents/Charts/GSHHG/

Pavel

[hasse_A]

Originally Posted by bcn

In the log file you shall see if the chart directory contains the GSSHG is getting included.

You can try to delete your entry of GSHHG from the chart directory list and then include it again. "Apply". This shall provoke a rescan of the chart data base and the inclusion of the newly added directory.

The base map which comes with OpenCPN is found at the application itself.

This is in the log-file.
9:17:05 PM: Loading World Chart Q=0 in 0 ms.
9:17:05 PM: Background world map loaded from GSHHS datafiles found in: C:\Users\hasse\Documents\Charts\GSHHG\
9:17:05 PM: Loading World Chart Q=4 in 0 ms.
9:17:05 PM: Warning: Color not found CHGRD

Actually I do get i more detailed map when the GSHHG entry is in the chart listing.

What if I move the GSHHG file to the OpenCPN program directory ?
In that case what should the directory name be to enable OpenCPN to find them ?
Maybe the weather routing needs to have the base map in the program tree ?

/Hans