WeatherFax ...

[ChuckSK]

rgleason

If you set Coord2 to have a different longitude from Coord1 it will work better. Notice that all the failed attemps have the same longitude.

[rgleason]

This is hard to believe for polars. That is correct, all my polars purposefully set Coord1 lat and Coord2 lat to the same value. I believe that is the intent. Why would it fail?

I'm burnt out on this, so I'll try it in a couple of days.

[seandepagnier]

I got the south africa map to work, but I had to manually enter the mapping coordinates. I think conic uses the same tangent transform as polar, only the mapping is in a different place, so it works as a polar image.

About the coordinates.... for polars you really must have different latitudes and longitudes for the mapping to work, otherwise it will fail. Preferably have the second coord as far as possible from the first to get the most correct results. Otherwise it probably divides by zero or tries to compute the square root of a negative number or something.

I updated the plugin a lot to fix a bunch of issues I found.. there were actually a lot of problems. Please let me know about the new version (0.5)

[rgleason]

In POLAR, What is the meaning of
"Resulting Image has negative dimensions, aborting"?

Does it have something to do with the Blue Rings?
The blue rings are outside of (or inside of) the latitude lines?

Does it have something to do with "Get Mapping"?
I always hit "Get Mapping" after I have adjusted the Coords.
Is that correct? Then I hit Apply.

Does it have something to do with the coordinate locations?
I have been aligning the longitude exactly (same value) for Coord 1 and Coord 2, is that the reason the message comes up?

If yes, does this message also occur in other instances?

If no, Why not give us a much better description!!!!!!!!

This is a black box to the user. I have spent hours on this and gotten this error and not known if I was doing something wrong or not, and did not know what to change. What I did was try to get more exact about what I thought we were supposed to be doing!.

There have been a lot of examples above, including the coords in text directly above, for example:

Pick Polar
Coord 1 70
-35
Coord 2 20
-35
Get Mapping take screenshot
Apply - resulting image has neg dimensions.

Is this wrong? ---I should be picking coords that do not align on longitude?

Sean wrote:
. for polars you really must have different latitudes and longitudes for the mapping to work, otherwise it will fail. Preferably have the second coord as far as possible from the first to get the most correct results.

Can we change the note by adding, "You may be picking the coordinates incorrectly, they should be as far apart as possible, do not align them along longitude." or is this note generated by a module outside of weatherfax?

[rgleason]

It built with 3 errors. Hope they show up in this screenshot

WeatherfaxWizard(483) error C3861 is nan : identifier not found
weatherfax_pi/weatherfax_pi.vcxproj

all 3 the same.

It did not seem to compile a new debug or release dll

[rgleason]

Tried one polar with the current (older) version of weatherfax.dll (debug) that complied several days ago.

I used totally separate coordinates with dismal results again.
Polar File : 13021903-Polar.png (attached)

Coordinate 1 lat 121 -50
long 70 90
Coordinate 2 lat 572 -10
long 404 160
Error:
"Mapping Failed" "Resulting Image has negative dimensions, aborting"
Then:
bitmap.cpp [802] Sorry, Sean. Its frustrating to both of us.

It would be very helpful to have a list of polars that we know work with either the download link or simply uploaded. Can someone suggest one so I am not working with Xxxxty files!

     KernelBase.dll!760c3219()     
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>    wxbase28ud_vc_custom.dll!wxTrap()  Line 678    C++
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[rgleason]

Tried again.

Have two blue ellipses that look right, describing the globe, rather than blue circles.

Same error

[rgleason]

It would be helpful if we could set a photo or image program to be an image browser withing weatherfax, such that clicking on a button in weatherfax will open the image browser/editor and open image file currently being used, so we can zoom in and scroll around to determine the exact coords etc.

Don't know if this is possible.

That would take the place of having a magnifier.

[ChuckSK]

This is what the blue circles should look like. Adjust the left/right location with the PoleX value and adjust the circle radius with the PoleY value. Set the True Width Ratio value to 1.0.

[rgleason]

Thank you Chuck very helpful.
Perhaps the "Information Button" should have more description for Polars.

Polar Projections
Coordinate 1 (Red) -Select a high latitude on the vertical meridian running through the pole (N or S)
Coordinate 2 (Blue) - Select an opposing corner (either side) with lower latitude.
Then hit Get Map, the Blue circles should follow the latitudes of respective coords. Adjust the left/right location with the PoleX value and adjust the circle radius with the PoleY value. Set the True Width Ratio value to 1.0.

[rgleason]

Success. It worked! Funny how following instructions helps.

I notice that Chuck's version has "Long/lat" and my Windows version has "Lat/Long" is there a reason? Might create some confusion in the future.

The "True width ratio" was 1.03 without any adjustment, so I guess that is positive. It is possible that the error "Resulting Image has negative dimensions, aborting" is due to this value being negative.

When the image is "Finished" and overlayed on the chart several things are noticed.

1. Cannot Zoom in and Zoom out - Scaling is frozen by the plugin for some reason, perhaps to apply the image. It needs to be unfrozen after the image is overlayed so we can more easily find it on the globe.

2. First transparency slider does not seem to work on the lines, but the second one does adjust the background full range white-black. I don't know if the first slider operation is somewhat dependent on the quality of the image.

Hitting "Edit" in the weatherfax window works fine. The image can be re-edited and applied.

[rgleason]

True width Ratio - Adjusts the width of the blue circles (a fraction like .8 makes the circles wider, and 1.2 makes them narrower.) Adjust the true width ratio such that the blue circles align with the associated latitude lines, otherwise the "Apply" transformation will not render straight lat/long lines or will fail.
Pole X - Moves the center of the blue circles left and right. The blue circles should be centered on the vertical meridian which goes through the pole.
Pole Y - Moves the center of the blue circles up and down. The blue circles should be centered on the pole. Hit get mapping to see how this is working, because the blue rings change in width, and sometime the ring closest to the pole flips if the value is too far out of whack.
Equator Y - This does not appear to do much when you change the value, more about this value later.

[rgleason]

If you are starting fresh with a Polar, and the blue rings are too wide after hitting Get Mapping, first check the lat/long entered and reset coords to be sure they are hit, then Hit 'get mapping again' then adjust the "True width ration" so the blue rings align with the latitude lines. Once that is done don't hit "Get Mapping" again, hit "Apply" the lines should be straight and orthogonal.

[rgleason]

Here's the most recent weatherfax_pi.dll that compiled, if someone wants to test it.
Take the doc off.

[seandepagnier]

Originally Posted by rgleason

Success. It worked! Funny how following instructions helps.

I notice that Chuck's version has "Long/lat" and my Windows version has "Lat/Long" is there a reason? Might create some confusion in the future.

The new version has them flipped so the image coordinate for X alines with longitude and Y with latitude. I added the ifdef thing for isnan on windows it should build now.

1. Cannot Zoom in and Zoom out - Scaling is frozen by the plugin for some reason, perhaps to apply the image. It needs to be unfrozen after the image is overlayed so we can more easily find it on the globe.

This should not be the case. Try with and without opengl. ALso try unchecking the image and see if you can zoom then and check it back.