I have nearly a thousand layers of geospatial data consisting only of Point layers and Line Layers and I just want to make it so that I only have one layer for each type.
Is there a way to filter to only run the Data Management Tools > Merge Vector Layers on just one type of layer at a time (e.g. Points only first and then Layer)?
Or at least on how to load only one of them at a time into QGIS? The data is from a (single) KMZ file.
You can use PyQGIS:
layerlist = []
for lyr in QgsProject().instance().mapLayers().values(): #For every layer added to the map
if lyr.geometryType()==1: #1 is line, 2 polygon, 0 point
layerlist.append(lyr) #If the geometrytype is 1, then append the layer to layerlist
processing.runAndLoadResults("native:mergevectorlayers", {'LAYERS':layerlist,'CRS':None,'OUTPUT':'TEMPORARY_OUTPUT'})
And if you want to you can automate the merging by grouping the geometry types using collections.defaultdict(list):
from collections import defaultdict as dd
list_them = dd(list)
numtoname = {0:'points', 1:'lines', 2:'polygons'}
for lyr in QgsProject().instance().mapLayers().values():
list_them[numtoname[lyr.geometryType()]].append(lyr)
for geomtype, layerlist in list_them.items():
print(geomtype)
print(layerlist)
processing.runAndLoadResults("native:mergevectorlayers", {'LAYERS':layerlist,'CRS':None,'OUTPUT':'TEMPORARY_OUTPUT'})
When you create a new, empty project and you load the kmz file, you can choose to load only point- or only line layers. Select one of them and do processing separately.
