QMapCompare

A QGIS plugin that enables you to compare maps smoothly.

(QGIS version 3.34 and above is required)

© OpenStreetMap Contributors © Geospatial Information Authority of Japan

Usage

• On left bottom panel, select comparing layers and click on one of the following buttons to start comparison:
  • Mirror
  • Vertical split
  • Horizontal split
  • Lens
• Map are updated on the fly when toggling comparing layers.
• Click on Stop button to end comparison.

Notes

• On Mirror mode, a synchronized map view panel is added, but panel position and size are to be set by user.
• On Split and Lens mode, a masking group layer QMapCompare_Group where comparing layers are duplicated in is added. Editing this group manually may cause unexpected visualization.
• Lens mode may not work in case of huge data where rendering takes a while. It can be solved manually in some cases as follow:
  • Go to QMapCompareMask layer properties.
  • Rendering Tab -> Refresh Layer at Interval -> Set an interval time longer than 0.2s.
  • Lens comparison may not be efficient when interval exceeds 1 second in case of very huge data.

More information

• English
• Japanese

Authors

• Raymond Lay (@bordoray) - original author
• And all contributors