Make NSW topo maps

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Make NSW topo maps

Postby tom_brennan » Tue 12 Dec, 2023 10:48 am

This may be of interest for those of you who have used NSWTopo (see this thread: https://bushwalk.com/forum/viewtopic.php?f=36&t=9028) in the past, or for those of you who currently use QGIS.

https://github.com/tombrennan06/qgis-nsw-topo

Basically, I've attempted to implement much of what NSWTopo does in QGIS - the main reason being that it's easier to then combine that data with other GIS data in a GIS system.

It still involves Python scripts and some config, so is not for the GIS novice. Some familiarity with QGIS will help.

2023-12-12 11_46_09-_Untitled Project — QGIS.png
2023-12-12 11_46_09-_Untitled Project — QGIS.png (435.93 KiB) Viewed 3860 times
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Re: Make NSW topo maps

Postby Allchin09 » Sun 17 Dec, 2023 2:50 pm

Very cool Tom! Looking forward to trying it out. Although, I think I might have to make a pull request to fix your upside down contour numbers
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Re: Make NSW topo maps

Postby Allchin09 » Sun 17 Dec, 2023 4:49 pm

Got it working :) This might be a good one to turn into a QGIS plug-in eventually, but easy enough to just open the scripts and run from there per your instructions. I did find though QGIS sometimes froze and then one un-freezing, not all layers were loaded.

topo-rnp.PNG


I also noticed what appeared to be more detailed contours lines?! I wonder what the coverage of those is?

topo-rnp-detailed-contours.PNG
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Re: Make NSW topo maps

Postby Allchin09 » Sun 17 Dec, 2023 5:03 pm

Just had a quick look at the contour source data and you can see the existence of the more detail contours in many places, mostly in built up areas.

topo-rnp-contours-online.PNG


topo-nn-contours-online.PNG


Shame they didn't include it as a separate layer instead of combining them all together.
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Re: Make NSW topo maps

Postby tom_brennan » Mon 15 Jan, 2024 3:49 pm

Allchin09 wrote:Although, I think I might have to make a pull request to fix your upside down contour numbers


I changed the style at least three times to try to get the contours right! If you can get it to consistently work, go for it!

Allchin09 wrote:I did find though QGIS sometimes froze and then one un-freezing, not all layers were loaded.


I hit that problem myself at times. I don't think I got to the bottom of why. Possibly a timeout on the server? In which case it might need some error handling. Otherwise it might have hit the server limit for features.

Allchin09 wrote:I also noticed what appeared to be more detailed contours lines?! I wonder what the coverage of those is?


More importantly, can they be identified so that they can be styled separately? Separate layer is less important if it's tagged well.
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Re: Make NSW topo maps

Postby Allchin09 » Mon 15 Jan, 2024 8:39 pm

I think you could use the verticalaccuracy field to identify the different contour types. I still think they should be different layers if they overlap, makes it hard to use as a mapservice tile map layer as you can't filter that way! Maybe your code could do something fancy though and seperate them into different ones :)
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