తెలుగులో GIS నేర్చుకుందాం

Arc GIS   for  Beginners Exercise-23 /  How to Search/Find tools in Arctool Box in ARCGIS తెలుగులో   నేర్చుకుందాం

Arc GIS   for  Beginners Exercise-22 / How to create Topolgy in ARCGIS తెలుగులో   నేర్చుకుందాం

Arc GIS   for  Beginners Exercise-21 / How to Add Delete Fields (Batch) in ARCGIS తెలుగులో   నేర్చుకుందాం

Arc GIS   for  Beginners Exercise-20 /  Selecting Features Based on Location / Select Layer by Location తెలుగులో   నేర్చుకుందాం

Arc GIS   for  Beginners Exercise-19 /  How to Create Geometry [automatic creation of lat/longs , Lengths & Areas] తెలుగులో   నేర్చుకుందాం

Exercise – 15 /   How to Create Topology in QGIS Topology Creation Topology describes the relationships between points, lines and polygons that represent the features of a geographic region. With the Topology Checker plugin, you can look over your vector files and check the topology with several topology rules. These rules check with spatial relations whether your features ‘Equal’, ‘Contain’, ‘Cover’, are ‘CoveredBy’, ‘Cross’, are ‘Disjoint’, ‘Intersect’, ‘Overlap’, ‘Touch’ or are ‘Within’ each other. It depends on your individual questions which topology rules you apply to your vector data (e.g., normally you won’t accept overshoots in line layers, but if they depict dead-end streets you won’t remove them from your vector layer). QGIS has a built-in topological editing feature, which is great for creating new features without errors. But existing data errors and user-induced errors are hard to find. This plugin helps you find such errors through a list of rules. It is ve...

Exercise – 14 /   Select by Location in QGIS Select by Location Spatial queries are core to many types of GIS analysis. Spatial queries allow you to select features in a layer by their spatial relationships (intersect, contain, touch etc.) with features from another layer.  The criteria for selecting features is based on the spatial relationship between each feature and the features in an additional layer. Add Polygon/Line/Point Layer to Layers panel Figure 153 - QGIS canvas with Line, point & polygon layers loaded Choose Vector → Research tools → Select by Location Select features from (Line / Point / Polygon) for selection Choose the relationship with other features from other layer with intersect, contain, touch, with in etc. Select comparing feature. Select options from modify current select by create new selection  add to current selection selecting within current selection removing from current selection Click on Run and close select by location windo...

Exercise – 13 /   How to add Geometry to Attributes in QGIS Add Geometry Attributes. The geometry tool is an easy to use tool that allows you to add the following geometry values to points, lines, and polygons: Point: The XCOORD and YCOORD columns will contain the x and y coordinates of the point Line: The SHAPE_LEN column will contain the length of the record's line(s) Polygon: The AREA and PERIMETER columns will contain the area and perimeter of the record's polygon(s). Add Geometry Attributes for Point. Add Point Layer to Layers panel Figure 134 - Point layer for adding geometry Open attribute table Figure 135 - Attribute table before adding geometry Choose Vector → Geometry tools →Add Geometry Attributes Figure 136 - Add geometry attributes window for Point Select input layer (Ex: Ind_Point) Select CRS from (Layer CRC / Project CRC / Ellipsoidal), better to select Layer CRS Click on Run Temporary layer will be created and added to Layer panel with Added geom info ...

Exercise – 12 /  How to Create GRID in QGIS Create Grid Generate a line or polygon grid based on user-specified grid spacing. Add Polygon/Line/Point Layer to Layers panel for creating GRID Figure 150 - QGIS canvas with polygon layer added for creation of GRID Choose Vector →Research tools →Create Grid Select Grid Type (Point / Line / Rectangle / Diamond / Hexagon) Select Grid extent (Use canvas extent / select extent on canvas / use layer extent) Suggestedto select use layer extent and select the layer and click on OK . Provide Horizontal spacing in meters / kilometers / feet / miles / yards Provide Vertical spacing in meters / kilometers / feet / miles / yards Provide Horizontal overlay in meters / kilometers / feet / miles / yards (if required only, or else leave as 0) Provide Vertical overlay in meters / kilometers / feet / miles / yards (if required only, or else leave as 0) Select Grid CRS Click on Run Temporary layer will be created and added to Layer panel with Grid ...