{"id":1829,"date":"2015-09-14T12:10:03","date_gmt":"2015-09-14T12:10:03","guid":{"rendered":"https:\/\/grindgis.com\/?p=1829"},"modified":"2015-10-05T12:05:21","modified_gmt":"2015-10-05T12:05:21","slug":"heat-map-using-qgis","status":"publish","type":"post","link":"https:\/\/grindgis.com\/?p=1829","title":{"rendered":"Create Heat Map Using QGIS"},"content":{"rendered":"

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A\u00a0Heat map<\/strong> is a graphical representation of point data which is used to visualize the diversity of data. Heat map is a best tool to find out the cluster where there is a high concentration. It\u00a0is also used for Hotspot analysis. It has a\u00a0wide variety of applications, for example the crime hotspot, traffic clustering or any data concentration.<\/p>\n

QGIS <\/a>is the best software available in the open source market for generating heat map. Heat map plug-in in QGIS is \u00a0used for creating heat map (density map) which is using a kernel density estimating algorithm. The\u00a0algorithm creates raster file from the point files (vector). \u201cThe density is calculated based on the number of points in a location, with larger number of clustered points resulting in larger values\u201d (QGIS consortium).<\/p>\n

Let us create a\u00a0heat map now. Here I am going to find out the Nacl concentration in wells. We have data from 120 wells.<\/p>\n

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\n1:\u00a0<\/span><\/strong>Open QGIS-Press \u201cCntrl+V\u201d keys on key board (Add vector data)<\/p>\n

2:\u00a0<\/span><\/strong>Vector layer window will open click on the \u201cbrowse\u201d and navigate to the folder where you\u00a0have the\u00a0vector file and press \u201cok\u201d<\/p>\n

\"Adding
\nFigure 1: Adding vector file to QGIS<\/span><\/em><\/p>\n

\"Vector
\nFigure 2: Vector file loaded in QGIS<\/span><\/em>[\/vc_column_text][\/vc_column][\/vc_row][vc_row layout=”normal” margintop=”0″ marginbottom=”15″ paddingtop=”0″ paddingbottom=”0″ bg_color=”#ffffff” bg_repeat=”repeat” bg_stretch=”no” en_border=”no” border_color=”#e8e8e8″][vc_column width=”1\/1″][ctitle title=”Activate Heat Map Plug-in” uppercase=”no” color=”#00b056″ background=”#ffffff” font_size=”20″ font_weight=”normal” position=”center”][\/vc_column][\/vc_row][vc_row layout=”normal” margintop=”0″ marginbottom=”15″ paddingtop=”0″ paddingbottom=”0″ bg_color=”#ffffff” bg_repeat=”repeat” bg_stretch=”no” en_border=”no” border_color=”#e8e8e8″][vc_column width=”1\/1″][vc_column_text]1:\u00a0<\/span><\/strong>Click on \u201cmanage and Install Plug-in\u201d in the main frame of QGIS<\/p>\n

\"manage<\/p>\n

2:\u00a0<\/span><\/strong>Plug-in manager will open<\/p>\n

3:\u00a0<\/span><\/strong>Type \u201cHeat map\u201d in the Search tab and activate if it is already installed or Click on Install if it is not installed in your system<\/p>\n

\"Plug-in
\nPlug-in manager with heat map plug-in activated<\/span><\/em><\/p>\n

Now Heat map Plug-in is activated<\/u><\/strong><\/p>\n

4:\u00a0<\/span><\/strong>Select the \u201cHeat map\u201d Plug-in from the \u201cRaster\u201d in the QGIS main frame<\/p>\n

\"Heat
\nHeat map Plug-in<\/span><\/em><\/p>\n