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Raster

Curvas hipsométricas

Descrição

Calcula curvas hipsométricas para feições da camada de polígonos e salva como CSV para futuro processamento.

Parâmetros

DEM to analyze [raster]
DEM to use for calculating altitudes.
Boundary layer [vector: polygon]
Polygonal vector layer with boundaries of areas used to calculate hypsometric curves.
etapa [number]

Distância entre as curvas

Padrão: 100.0

Use % of area instead of absolute value [boolean]

Write area percentage to “Area” field of the CSV file instead of absolute area value.

Padrão: Falso

Saídas

Caminho de saída [Diretório]

Directory where output will be saved. For each feature from input vector layer CSV file with area and altitude values will be created.

File name consists of prefix hystogram_ followed by layer name and feature ID.

Uso do console

processing.runalg('qgis:hypsometriccurves', input_dem, boundary_layer, step, use_percentage, output_directory)

Veja tambem

Estatísticas da camada raster

Descrição

Calcula estatísticas básicas da camada raster.

Parâmetros

Camada de Entrada [raster]

Camada de análise.

Saídas

Estatísticas` [html]

Análise dos resultados no formato HTML

Valor mínimo [número]

Valor minímo da célula

Valor máximo [número]
Maximum cell value.
Sum [number]
Sum of all cells values.
Mean value [number]
Mean cell value.
valid cells count [number]
Number of cells with data.
No-data cells count [number]
Number of NODATA cells.
Standard deviation [number]
Standard deviation of cells values.

Uso do console

processing.runalg('qgis:rasterlayerstatistics', input, output_html_file)

Veja tambem

Zonal Statistics

Descrição

Calculates some statistics values for pixels of input raster inside certain zones, defined as polygon layer.

Following values calculated for each zone:

  • mínimo

  • máximo

  • Soma

  • Contagem

  • Média

  • standard deviation
  • number of unique values
  • range

  • Variância

Parâmetros

“Camada raster” [raster]

Camada de análise.

Raster band [number]

Number of raster band to analyze.

Padrão: 1

Vector layer containing zones [vector: polygon]
Layer with zones boundaries.
Output column prefix [string]

Prefix for output fields.

Padrão: _

Load whole raster in memory [boolean]

Determines if raster band will be loaded in memory (True) or readed by chunks (False). Useful only when disk IO or raster scanning inefficiencies are your limiting factor.

Padrão: True

Saídas

“camada de saída” [vetor]
The resulting layer. Basically this is same layer as zones layer with new columns containing statistics added.

Uso do console

processing.runalg('qgis:zonalstatistics', input_raster, raster_band, input_vector, column_prefix, global_extent, output_layer)

Veja tambem