on February 1, 2023
Time required to get results by solar radiation tool?
Geographic Information SystemsHow do you calculate global solar radiation? Global Horizontal Irradiance (GHI), from the hemisphere above a horizontal plane surface, is a combination of DNI, corrected for the angle of incidence of the beam (θ), and Diffuse Horizontal Irradiance (DHI). GHI = DNI*cosθ + DHI. All these parameters are measured in units of W/m2. What is
on February 1, 2023
To remove clouds of Landsat 8 surface reflectance products
Geographic Information SystemsHow do I remove cloud from Landsat 8 images? Clean up a collection of Landsat images Open the Add Rasters to Mosaic Dataset tool again. Click the Edit button next to the Processing Template parameter to define a custom template that will mask out pixels of cloud and shadow. How do I get rid of
on February 1, 2023
Changing GRASS language within QGIS?
Geographic Information SystemsHow to change interface language in QGIS? The QGIS interface is natively programmed in English. However, at this moment over forty other languages are already available. To start QGIS with the appropriate localization, run qgis –lang in command line or change localization in QGIS under Settings ‣ Options ‣ General ‣ Locale menu. What is
on February 1, 2023
Extracting part of shapefile
Geographic Information SystemsHow do I extract part of a shapefile in Qgis? (1) On the menu bar, select Vector -> Geometry Tools -> Extract Vertices. A popup box will ask which layer you wish to extract nodes from, and how you want to save the new layer. Click OK, and a new points-only layer should appear. How
on February 1, 2023
Web map survey/questionnaire
Geographic Information SystemsWhat are the main 4 types of survey questionnaires? While there isn’t an official book of survey questions or survey taxonomy, I find it helpful to break down survey questions into four classes: open-ended, closed-ended (static), closed-ended (dynamic), and task-based. What are good questions to ask about a map? How do maps work? Why is
on February 1, 2023
Changing the geometry of polygon in OpenLayers 2
Geographic Information SystemsWhat are the geometry types in Openlayer? The geometry type. One of ‘Point’ , ‘LineString’ , ‘LinearRing’ , ‘Polygon’ , ‘MultiPoint’ , ‘MultiLineString’ , ‘MultiPolygon’ , ‘GeometryCollection’ , or ‘Circle’ . How do you draw a polygon with Openlayers? Select a geometry type from the dropdown above to start drawing. To finish drawing, click the
on February 1, 2023
QGIS Features to polygons
Geographic Information SystemsHow do I create a shapefile from selected features in QGIS? Once the features have been selected, right click on your dataset and select the “save as” option from the menu. From the interface select the desired file format. Under encoding click the “Save only selected features” box. Click “Browse”and designate the file name and
on February 1, 2023
Problem with projection in meters with ArcGIS 10.1
Geographic Information SystemsHow do I fix ArcGIS projection? Answer Open ArcToolbox and select Data Management Tools > Projections and Transformations > Define Projection. Choose the appropriate coordinate system. You have to define it as what it is, not as what you want it to be. Once the projection is defined correctly, the projection can be changed.
on February 1, 2023
Converting Excel into shapefile (keeping encoding and data type)
Geographic Information SystemsHow do I convert Excel to shapefile? Quote from video: So now in order to convert this into a shape file first we need to change the file format. So go to the option file and go to the option save as and here just select the option browse. How do I convert Excel to
on February 1, 2023
GRASS Processing not working on QGIS?
Geographic Information SystemsHow do I enable GRASS in QGIS? To launch GRASS from within QGIS, you need to activate it as with any other plugin: First, open a new QGIS project. In the Plugin Manager, enable GRASS in the list: The GRASS toolbar and the GRASS panel will appear: Fig. 12.10 GRASS toolbar. Fig. 12.11 GRASS Panel.