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New QGIS functions for power users Dr. Marco Hugentobler, - PowerPoint PPT Presentation

Apr 14, 2023 •292 likes •496 views

New QGIS functions for power users Dr. Marco Hugentobler, Sourcepole Twitter: @sourcepole FOSS4G 2015 New QGIS functions for power users Content > Version history > Live Layer effects > New geometry classes > Geometry checker

  1. New QGIS functions for power users Dr. Marco Hugentobler, Sourcepole Twitter: @sourcepole FOSS4G 2015 New QGIS functions for power users

  2. Content > Version history > Live Layer effects > New geometry classes > Geometry checker FOSS4G 2015 New QGIS functions for power users

  3. Version history > QGIS 2.8 LTS 20.02.2015 > QGIS 2.10 26.06.2015 > QGIS 2.12 23.10.2015 > Visual changelogs: > https://www.qgis.org/en/site/forusers/visua lchangelog28/index.html > https://www.qgis.org/en/site/forusers/visua lchangelog210/index.html FOSS4G 2015 New QGIS functions for power users

  4. Live layer effects (2.10) > Image modifications based on symbol or symbol layer > 'Photoshop' for QGIS > Chainable sequence of: > Source > Transform > Blur > Drop shadow / inner shadow > Inner glow / outer glow > Colorize > Combination with transparency and blend modes FOSS4G 2015 New QGIS functions for power users

  5. Live layer effects (2.10) FOSS4G 2015 New QGIS functions for power users

  6. Live layer effects (2.10) FOSS4G 2015 New QGIS functions for power users

  7. New Geometry Core - Motivation > QgsGeometry works fine, but difficult to extend > Limited to points and linear geometries > Curved geometries can only be displayed using ST_CurveToLine > Problem: curve is lost when editing FOSS4G 2015 New QGIS functions for power users

  8. New Geometry Core - Goals > Support for SQL/MM curved geometries > CircularString > CompoundCurve > CurvePolygon > MultiCurve > MultiSurface > Z and M values > Should be extensible with new types (e.g. Bézier-Splines) > Compatibility with current QgsGeometry interface FOSS4G 2015 New QGIS functions for power users

  9. New Geometry Core - Support Data Sources Providers QgsPostgresProvider QgsOgrProvider Formats Core QgsOracleProvider . . . . . . > Support depends on provider and data source FOSS4G 2015 New QGIS functions for power users

  10. New Geometry Core – State QGIS 2.10 > New geometry kernel (XYZM/Curves) > QGSGeometry compatibility class > Segmentation for geometry processing (intersection, buffering, etc.) > Support in PostGIS provider > Python bindings FOSS4G 2015 New QGIS functions for power users

  11. State QGIS 2.12 > Visualization, measurement of length / area directly on curve (if planar measurment) > Construction tools: > Arc with start point / curve point / endPoint > Arc with start point / end point / radius > Support in marker line renderer > Node editor as part of node tool FOSS4G 2015 New QGIS functions for power users

  12. New Geometry Core - Architecture QgsGeometryEngine QgsGeometry QgsGeos QgsAbstractGeometry QgsSurface QgsCurve QgsPoint QgsGeometryCollection QgsCurvePolygon QgsLineString QgsMultiPoint QgsPolygon QgsCircularString QgsMultiCurve QgsCompoundCurve QgsMultiSurface > Retains QgsGeometry interface > Easily extensible with new geometry types > Abstract geometry engine FOSS4G 2015 New QGIS functions for power users

  13. New Geometry Core - Conclusions ✔ Support for curves, Z and M values ✔ Easily extensible ✔ Compatibility with legacy interface > Existing plugins will keep working ✔ Opens up the possibility for 3D functionality Geometry engine (GEOS) limitations: > Segmentation for analysis operations > Missing M values support (patch available) FOSS4G 2015 New QGIS functions for power users

  14. Geometry Checker - Errors Holes Self intersections Duplicate nodes Minimum angle Segment length Minimum area Sliver polygons ℓ Feature within Gaps Duplicates Overlaps feature FOSS4G 2015 New QGIS functions for power users

  15. Geometry Checker - Setup > Select checks to perform FOSS4G 2015 New QGIS functions for power users

  16. Geometry Checker – Errors overview FOSS4G 2015 New QGIS functions for power users

  17. Geometry Checker – Fix error FOSS4G 2015 New QGIS functions for power users

  18. Geometry Checker – Error tracking FOSS4G 2015 New QGIS functions for power users

  19. Geometry Checker – Fix multiple errors FOSS4G 2015 New QGIS functions for power users

  20. FOSS4G 2015 Thank you! Marco Hugentobler marco@sourcepole.ch FOSS4G 2015 New QGIS functions for power users

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