Hi Zoltan,
I guess your first item is covered here:
https://www.youtube.com/watch?v=NCsnTt6uxXo
I call the video "Atlas on steroids" ;-)
Regards,
Roland
Gesendet: Freitag, 15. Oktober 2021 um 10:39 Uhr
Von: "Zoltan" <[email protected]>
An: "qgis-user" <[email protected]>
Betreff: [Qgis-user] QGIS Atlas gymnastics
Von: "Zoltan" <[email protected]>
An: "qgis-user" <[email protected]>
Betreff: [Qgis-user] QGIS Atlas gymnastics
Hi,
I wonder if someone can confirm if below is possible or not, using the Atlas facilities QGIS 3.20.3 in WIndows 10.
Two issues, the second relying on the first.
#1 Variable size Map Item.
I would like to vary the size of the Map Item window, depending on the zoom window of the Atlas page.
I can set the "Position and Size" using an _expression_ or an attribute Field, but this seems to be fixed rather than dynamic
ie: Is it possible to have _expression_ and/or Field values dynamic per Atlas coverage page?
#2 Multiple Sub-maps per MapSheet.
Is it possible to have an Atlas page layout such that (say) in the top half of the page you have your zoomed map (as in #1 above) and in the bottom half of that sheet-page you place n-mapboxes as insets predefined as n-AOI rectangles inside the zoom-window in the top of this MapPage?
A practical example/use would be:
Say you are doing an aerial analysis of a stretch of river and you have identified areas of interest by placing oriented rectangles around them.
You now want to show an overview of segments of the river, and then a zoom-in to each identified AOI rectangle to show larger scale prints below this river segment.
Method could/would be to:
Anyone achieved something like this?
Does this sound useful?
I guess, unless I've missed some facility in Atlas, I will be doing this by using the Atlas facility to spit out carefully named jpeg images, and then assembling the pages using Python and LibreOffice (or something).
All thoughts/directions welcome.
Kind regards,
Zoltan
I wonder if someone can confirm if below is possible or not, using the Atlas facilities QGIS 3.20.3 in WIndows 10.
Two issues, the second relying on the first.
#1 Variable size Map Item.
I would like to vary the size of the Map Item window, depending on the zoom window of the Atlas page.
I can set the "Position and Size" using an _expression_ or an attribute Field, but this seems to be fixed rather than dynamic
ie: Is it possible to have _expression_ and/or Field values dynamic per Atlas coverage page?
#2 Multiple Sub-maps per MapSheet.
Is it possible to have an Atlas page layout such that (say) in the top half of the page you have your zoomed map (as in #1 above) and in the bottom half of that sheet-page you place n-mapboxes as insets predefined as n-AOI rectangles inside the zoom-window in the top of this MapPage?
A practical example/use would be:
Say you are doing an aerial analysis of a stretch of river and you have identified areas of interest by placing oriented rectangles around them.
You now want to show an overview of segments of the river, and then a zoom-in to each identified AOI rectangle to show larger scale prints below this river segment.
Method could/would be to:
Using the width of your intended page size, calculate the length of river you can fit across 1 page of your Atlas. Let's assume 1KmI suppose this is rather like wanting an Atlas page-set within and Atlas page.
Now a river meanders so you cannot run down the polyline depicting the river, you need to rotate and cut the river to the width of your atlas page.
This means your atlas Map-Item width will be constant, but the height, due to curvatures in the river, will vary.
Once you have your oriented MBRs calculated along the river, you can use these as your Atlas Coverage layer.
To show this with optimal page-area usage, you would need the Atlas facility I describe in #1 above.
Now, along the river you will have pre-placed your oriented AOI rectangles.
These will be much smaller rectangles than the 1Km river-length Atlas Coverage rectangles.
Now, for each AOI rectangle inside the current 1Km coverage rectangle, I want to show a larger scale image below the current coverage rectangle.
If #2 above was possible and flexible, one could use the calculated (current) bottom left paper coord of the coverage rectangle to calculate the top-left position of the first AOI area.
And so on across then down the remaining Atlas page for subsequent AOI boxes, which will likely be of varying size.
Anyone achieved something like this?
Does this sound useful?
I guess, unless I've missed some facility in Atlas, I will be doing this by using the Atlas facility to spit out carefully named jpeg images, and then assembling the pages using Python and LibreOffice (or something).
All thoughts/directions welcome.
Kind regards,
Zoltan
-- ============================================= Zoltan Szecsei GPrGISc 0031 Geograph (Pty) Ltd. GIS and Photogrammetric Services
Cape Town, South Africa. Mobile: +27-83-6004028 (Signal, not WhatsApp) www.geograph.co.za =============================================_______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
_______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
