Merging CSV layers (XYZ files with point coordinates)

Question

I have list of many XYZ files with points without header an space delimited.

Example:

-877500 -1014000 471.95
-877500 -1013995 472.28
-877500 -1013990 472.61
-877500 -1013985 473.04
-877500 -1013980 473.39

I would like to merge all files into one QGIS point layer. I was trying this tutorial and no luck with Python. Anyway it doesn't describe working with CSV files as I have trouble defining sole VRT with custom delimiter. I couldn't find definitions for them in VRT driver neither CSV driver.

When trying ogrinfo with .xyz file couldn't read the file. If I change the extension to .csv it reads without trouble. I was not aware that <OGRVRTLayer name=" "> has to be the same as CSV file without extension. Finally I managed to combine files with suggestions from comments and using this code:

<OGRVRTDataSource>
    <OGRVRTLayer name="merged">
        <SrcDataSource relativeToVRT=1>merged.csv</SrcDataSource>
        <GeometryType>wkbPoint</GeometryType>
        <LayerSRS>EPSG:5514</LayerSRS>
        <GeometryField encoding="PointFromColumns" x="field_1" y="field_2" z="field_3"/>
        <Field name="x" type="Integer" src="field_1" />
        <Field name="y" type="Integer" src="field_2" />
        <Field name="z" type="Real" src="field_3" />
    </OGRVRTLayer>
</OGRVRTDataSource>

Answer 1

A little confused about your file extensions, but assuming they are CSV...

If you have a folder containing your multiple files e.g.

You can run a command in Windows CMD Prompt to merge these with ease (Run the command window from that folder - either open it through Windows Explorer or cd to it):

copy *.csv merged.csv

This will create a new file called merged.csv which contains all records from other CSVs it found (watch out here as over 1 million rows and you will not be able to open it in Excel).

Looking in my new merged file I can do the following:

1. Remove the carriage return at the bottom

2. Add a header row (If you have a header file you can do this in a second merge process by using copy header.csv + merged.csv finished.csv)

Providing this is all well and dandy, you can then import this into QGIS using Add Delimited Text Layer and define a custom delimiter if you need it. Point QGIS to the X and Y field (if it hasn't grabbed them automatically), define your projection and import it.