Point overays

[pstruzik]

I would like to add two different point overlays to the composition.
For one point overlay, I use:

#definition of points:
poi_list = [((10.75, 59.92), 'OSLO'),
((18.05, 59.33), 'STOCKHOLM'),
((24.93, 60.17), 'HELSINKI'),
((24.72, 59.43), 'TALLINN'),
....
]
points = {'font': '/home/piotr/EMCdata/Fonts/DejaVuSans.ttf',
'font_size': 35, 'points_list': poi_list, 'symbol': 'circle', 'ptsize': 25,
'outline': (200, 50, 50), 'fill': 'white', 'width': 10, 'fill_opacity': 255,
'box_fill': (255, 255, 255), 'box_opacity': 70}

and in save.dataset:

scn_resampled.save_dataset(composite, 'Picture.png',
overlay={'coast_dir': '/home/piotr/EMCdata/gshhg-shp',
'overlays': {'coasts': coast,
'borders': borders,
'rivers': rivers,
'points': points,
}},
decorate = {'decorate': deco}
)

I works perfect. But how to use two differnt poi_lists with different font size and symbol ?
I have tried:
scn_resampled.save_dataset(composite, 'Picture.png',
overlay={'coast_dir': '/home/piotr/EMCdata/gshhg-shp',
'overlays': {'coasts': coast,
'borders': borders,
'rivers': rivers,
'points': points,
'points': points2,
}},
decorate = {'decorate': deco}
)

In such case only second set of points is overlaid.

Best regards,
Piotr

[djhoese]

It's been a while since I've used the overlays API, but your primary issue in your last attempt is how you're creating your dictionary. You have two points keys in the dictionary, so one is overwriting the other. That's expected in Python, but this normal way of creating a dictionary doesn't cause an error.

As for fixing this...I'm not sure there is a way to do this from Satpy. You'd need to create a PIL Image of the Satpy dataset:

from trollimage.xrimage import XRImage

xr_img = XRImage(scn[composite])
pil_img = xr_img.pil_image()

and use the pycoast package directly to be able to call ContourWriterAGG.add_points multiple times with each of the different fonts. I'm sorry I don't have more details to provide right now, I've never done this.

[pstruzik]

Thank you for suggestion. Are any examples of ContourWriterAGG.add_points use? Does it allow to use longitudes/latitudes of points, not x/y position of resulting image ?

To be more clear. I have defined a dictionary with capital cities in Europe by "poi_list=" and "points=". Now, I have started to create second dictionary with some main cities in Europe,but I wanted to overlay them with smaller symbol and font. I have at the moment:
First dictionary:

poi_list1 = [((10.75, 59.92), 'OSLO'),
	    ((18.05, 59.33), 'STOCKHOLM'),
	    ((24.93, 60.17), 'HELSINKI'),
	    ((24.72, 59.43), 'TALLINN'),
	    ((24.10, 56.95), 'RIGA'),
	    ((25.32, 54.68), 'VILNIUS'),
	    ((27.57, 53.90), 'MINSK'),
	    ((37.58, 55.75), 'MOSCOW'),
	    ((30.52, 50.43), 'KIEV'),
	    ((21.00, 52.25), 'WARSAW'),
	    ((12.58, 55.67), 'COPENHAGEN'),
	    ((13.40, 52.52), 'BERLIN'),
	    ((-6.23, 53.32), 'DUBLIN'),
	    ((-0.17, 51.50), 'LONDON'),
	    ((4.90, 52.38), 'AMSTERDAM'),
	    ((4.33, 50.83), 'BRUSSELS'),
	    ((2.33, 48.87), 'PARIS'),
	    ((6.12, 49.60), 'LUXEMBOURG'),
	    ((7.43, 46.95), 'BERN'),
	    ((9.52, 47.13), 'VADUZ'),
	    ((-9.13, 38.72), 'LISBON'),
	    ((-3.68, 40.40), 'MADRID'),
	    ((7.42, 43.73), 'MONACO'),
	    ((12.42, 43.93), 'SAN MARINO'),
	    ((12.48, 41.90), 'ROME'),
	    ((14.47, 50.08), 'PRAGUE'),
	    ((16.37, 48.20), 'VIENNA'),
	    ((17.12, 48.15), 'BRATISLAVA'),
	    ((19.08, 47.50), 'BUDAPEST'),
	    ((14.52, 46.05), 'LJUBLJANA'),
	    ((16.00, 45.80), 'ZAGREB'),
	    ((18.42, 43.87), 'SARAJEVO'),
	    ((19.27, 42.47), 'PODGORICA'), 
	    ((20.50, 44.83), 'BELGRADE'),
	    ((21.43, 42.00), 'SKOPJE'),
	    ((19.82, 41.32), 'TIRANE'),
	    ((23.32, 42.68), 'SOFIA'),
	    ((26.10, 44.43), 'BUCHAREST'),
	    ((23.73, 37.98), 'ATHENS'),
	    ((14.50, 35.88), 'VALLETTA'),
	    ((28.85, 47.00), 'CHISINAU'),
	    ((32.87, 39.93), 'ANKARA'),
            ((-6.83, 34.03), 'RABAT'),
            ((3.15, 36.73), 'ALGIERS'),
            ((10.15, 36.83), 'TUNIS'),
            ((13.18, 32.9), 'TRYPOLI'),
            ((31.23, 30.05), 'CAIRO'),
            ((35.23, 31.78), 'JERUSALEM'),
            ((35.5, 33.88), 'BEIRUT'),
            ((36.28, 33.5), 'DAMASCUS'),
            ]
points1 = {'font': 'C:/EMCtools/pyscripts/DejaVuSans.ttf',
          'font_size': 35, 'points_list': poi_list1, 'symbol': 'circle', 'ptsize': 25,
          'outline': (0, 0, 0), 'fill': 'white', 'width': 10, 'fill_opacity': 255, 
          'box_fill': (255, 255, 255), 'box_opacity': 70}

Second dictionary:

poi_list2 = [((-7.59, 33.59), 'Casablanca'),
	    ((-5.32, 35.77), 'Tanger'),
            ((-8.62, 41.14), 'Porto'),
            ((-5.35, 36.16), 'Gibraltar'),
            ((-4.14, 50.37), 'Plymouth'),
            ((1.32, 51.13), 'Dover'),
            ((-3.18, 55.95), 'Edinburgh'),
            ((-4.25, 55.86), 'Glasgow'),
            ((-2.24, 53.49), 'Manchester'),
            ((-1.86, 52.49), 'Birmingham'),
            ((-4.49, 48.39), 'Brest'),
            ((0.13, 49.49), 'Havr'),
            ((1.86, 50.95), 'Calais'),
            ((-0.51, 44.85), 'Bordoaux'),
            ((4.90, 45.79), 'Lyon'),
            ((-1.47, 47.25), 'Nantes'),
            ((5.14, 47.37), 'Dijon'),
            ((0.28, 48.05), 'Le_Mans'),
            ((3.14, 50.65), 'Lille'),
            ((4.55, 51.95), 'Rotterdam'),
            ((7.08, 50.96), 'Köln'),
            ((8.74, 50.12), 'Frankfurt_am_Main'),
            ((14.25, 53.91), 'Świnoujście'),
            ((18.65, 54.35), 'Gdańsk'),
            ((10.13, 54.31), 'Kiel'),
            ((12.11, 54.15), 'Rostock'),
            ((13.01, 55.62), 'Malmö'),
            ((13.83, 55.43), 'Ystad'),
            ((20.46, 54.70), 'Królewiec'),
            ((21.14, 55.71), 'Klaipėda'),
            ((30.29, 59.90), 'St._Petersburg'),
            ((11.96, 57.71), 'Göteborg'),
            ]
points2 = {'font': 'C:/EMCtools/pyscripts/DejaVuSans.ttf',
          'font_size': 20, 'points_list': poi_list2, 'symbol': 'circle', 'ptsize': 15,
          'outline': (0, 0, 0), 'fill': 'white', 'width': 7, 'fill_opacity': 255, 
          'box_fill': (255, 255, 255), 'box_opacity': 70}` 

I found in the net solution:
`scn_resampled.save_dataset(composite, imgdir+ 'Picture.png',
             overlay={'coast_dir': 'C:/EMCdata/gshhg-shp',
                      'overlays': {'coasts': coast,
                                  'borders': borders,
                                  'rivers': rivers,
                                  'points1': points1,
                                  'points2': points2
                                  }
                 },
          decorate = {'decorate': deco}
          )

But it doesn't work. I could imagine, that points1 and points2 are not a keys.

So, I tried to concatenate two dictionaries:

pointsX = points1 | points2

and

scn_resampled.save_dataset(composite, imgdir+ 'Picture.png',
             overlay={'coast_dir': 'C:/EMCdata/gshhg-shp',
                      'overlays': {'coasts': coast,
                                  'borders': borders,
                                  'rivers': rivers,
                                  'points': pointsX,
                                  }
                 },
          decorate = {'decorate': deco}
          )

Doesn't work. The dictionary pointsX has only second set of points.
Of course is possible to merge all points in one poi_list, but in such case the same symbol and font size will be applied.

What, I am doing wrong with those two dictionaries?

[pstruzik]

Sorry for such view of code. I have tried to put code using <> but all new_line codes were lost.

Regards,
Piotr

[djhoese]

I've fixed the formatting of your post. For blocks of code having three backticks (`) before and after should format things properly.

For examples, check the pycoast documentation:

API documentation for add_points:

https://pycoast.readthedocs.io/en/latest/api/pycoast.cw_base.html#pycoast.cw_base.ContourWriterBase.add_points

Example:

https://pycoast.readthedocs.io/en/latest/points.html

[pstruzik]

Many thanks for help.