Quantum GIS (QGIS) is a free and open-source software for geographical information system (GIS) usage. It is helpful to visualize and analyze Pix4D outputs.
Simply drag and drop the .tif file into the main view of QGIS.
If multiple files have been imported, create a Virtual Raster to manage the DSM / DTM files as one single file. For more information: QGIS help.
For more information about editing the classification of evaluation values, click here.
1. Drag and drop the .tif file into the main view of QGIS.
Note: Contour lines in the shapefile (.shp) format are required. They can be generated from the DSM (How to generate the Contour Lines) or the DTM (How to generate Contour Lines based on the DTM).
1. Find the contour lines in 3_dsm_ortho/extras/contours.
2. Drag and drop the contour lines .shp file onto the main view of QGIS.
3. Right-click on the contour lines layer and click Properties.
4. Select the tab Labels.
5. From the drop-down list Label this layer with, select Elevation and ensure the box is checked.
The final result will have the contour lines along with the associated elevation values.
When the area of interest is very big and the amount of data is large, multiple Pix4Dmapper projects can be created for one area. To merge .tif files that are generated from the multiple projects, use an external GIS software like Quantum GIS.
1. On the menu bar, click Raster > Miscellaneous > Merge.
2. In the field Input files, click Select, browse for the tiles to merge, select them and click Open (use the shift key in order to select all).
3. In the field Output files, click Select, set the name of the output mosaic / DSM and select the format GeoTIFF (*...). Choose where to export the new merged file and click Save.
4. (DSM only) check the box No data value and set it to -10000.
5. Check the box Load into canvas when finished in order to see the merged file once it is generated.
1. Drag and drop the GeoTIFF file onto the main view of QGIS.
4. Enter a name and select the type of file JPEG JFIF.
6. In the window Translate (Convert Format), click OK.
2. Browse to the directory with the individual images. Hold down the Ctrl key and click on the image files to make a multiple selection. Click Open.
3. Create a single Mosaic image from all these individual images.
4. Click Raster > Miscellaneous > Merge.
Note: To enable the Raster menu in QGIS the core plugin called GdalTools is needed. Enable the GdalToolsplugin from: Plugins > Manage and install plugins > Installed.
6. In the Input files browse the directory that contains all the individual geotiffs. Hold Ctrl key and select all the subsets.
7. Click Select... next to Output file and name the output.