Decission Support regional scale

Data

Urban Atlas

Earth Explorer SRTM

Preprocessing

Coordinate System (CS)

XYZ Tiles in QGIS - base maps are available


DTM SRTM

Coordinate Reference System (CRS)


Urban Atlas

Coordinate Reference System (CRS)

PROJECT Coordinate system

QGIS Coordinate system transformation on-the-flight

CS EPSG codes

Coordinate system definition:

Feature Coordinate system

Advice: Avoid geographical coordinate system

Simplest method: (right klick on the feature in legend-Export-Save feature as):

details:

remarks:

-dispalying, stretching

-"cosmetics" Processing-Tollbox-Gaussin filter

RASTER other functionality -check pixel size and modify the spatial extend Xmin, Xmax, Ymin, Ymax divisible by pixel size without rest

DS_regional_1

DS_regional_2

GIS as DSS location selection

sample criteria

Vector-raster model

  1. UA attribute table analysis: which attribute are number, and which string
  2. UA - rmk (right mouse klick) - attribute table-edit-field calculator, create new field (integer) assign code2018 as a new field (int) code2018_int
  3. SQL: UA-urban, UA-water using code219int "code2018int">=11100 and "code2018int"<=14200
  4. SQL: UA-water, UA-water using code219int "code2018int">=11100 and "code2018int"<=14200 "code2018int" >=40000 and "code2018int" <=50000
  5. Analysis using QGIS Graphical modeler

Graphical Modeller

model_vector

DEM>500m

regional_vec_1_1

Water buffer 250m

regional_vec_2

Urban buffer 500m

regional_vec_3

Difference Urban buffer 500m - Water buffer 250m

regional_vec_4

Final_result

regional_vec_7_ver1

Final_result zoom

regional_vec_7_ver1_zoom


Variant no.2

DEM>400m

regional_vec_1_1_ver0

Final_result

regional_vec_7


Raster model

model_raster

Final result raster

final_result_raster

Final result raster vektor

final_result_vector

Final result raster vector

final_result_raster_vector

Why do we obtaine different results in raster and vector model ?


26.11.2021