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Popeye82

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29/09/24

01:16

Post #: 75889160
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Originally posted by Polonium210: ↑

QGIS has been a total game-changer…for what is effectively free-software. I was formally trained using ArcGIS and MapInfo, but made the switch in 2011 as the company I was with had a limited number of licences to ARC. At that time the QGIS functionality was undeniably below par relative to the others….but it was free.Now 10+ years on, I feel it outperforms the expensive license software for basic to advanced analysis and visualisation GIS processes like gridding and interpolation etc
Combine its inbuilt functions with the add-in tools ecosystem and its an absolute powerhouse GIS system. …I really don’t understand why any company would bother forking out $$$$/year for restrictive ‘professional’ software, some say ‘ah well you get the support with paid software’…but goodluck speaking to a person at Precisely/Pitney or Esri and the online support and resources for QGis trumps all the rest.
Anyway, that was a long-winded way of also singing the praises of QGIS.

Re the registering and importing existing map overlays – yes its simple and functional.You have full optionality over the transformation type (linear-helmert-projective-polynomials etc) – can either enter ground control points and type in the coordinates from image grid, or if the figure does not have a suitable grid overlay then you can add the control points straight from the scene…simple.
In most cases the in-built options work, sometimes you just need to add more control points if the image has been scanned poorly or is warped.For very poor image scans, or for maps that are not drawn to scale uniformly then there is a free-form registration tool (drag-rotate-scale).
Plus on-the-fly transformation means if you have a map/figure that is either georeferenced or has grid overlay using another CRS then it will automatically display it in whatever the project CRS is using.

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thx, 4 explaining That

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