Calculate velocity and errors from distance between GPS points
Geographic Information SystemsHow do you find velocity with GPS coordinates? First we plot the two GPS points on a spherical model of the earth, then calculate the angle between them using a dot product, then calculate the ‘Great Circle’ distance using this angle and the earth’s radius and finally we divide by the elapsed time to approximate
ArcMap attribute joins generating incorrect values
Geographic Information SystemsWhy does the attribute table have null or empty values after a join? After performing a join, the values in the fields from the joined table might appear empty or null. Null values can be the result of several factors: Values in the specified fields for the join do not match. Joins are case sensitive,
Calculate new Lat/Lon from initial Lat/Lon plus Cartesian X,Y
Geographic Information SystemsHow do you convert XY coordinates to latitude and longitude? Calculate latitude and longitude using the formula: latitude = asin (z/R) and longitude = atan2 (y,x). In this formula, we have the values of x, y, z and R from step 2. Asin is arc sin, which is a mathematical function, and atan2 is a
Using QGIS shapefile layer in ArcMap project?
Geographic Information SystemsCan I use QGIS file in ArcGIS? The basic data is usable in qgis. Arcgis is the native software that shape files are used in. Now shape files are in the open specification realm. There are many other data formats though that both qgis and arcgis read and write. How do I convert QGIS to
How do I save a polygon once I have created it in editor?
Geographic Information SystemsHow do you save a polygon? You need to finish the polygon’s construction with double click, right-click>Finish Sketch or F2 before saving edits. How do I save an edited shapefile in ArcGis? 1 Answer Start ArcGis and add data to the Data Frame, if needed. Right-click the layer and select Data > Export Features. Click
Converting Trimble SSF format to shapefile?
Geographic Information SystemsHow to convert SSF to shapefile? Quote from video: And down here we're going to click on new. And from here we choose what kind of file we want to save it as and we want to save it as an ESRI shape file. So then you just click OK. How do I open a
SAS Planet exporting KML files
Geographic Information SystemsHow do I export a KML file? Double-click Export KML. On the General page of the Export KML wizard, specify place information for the file. On the Objects page, specify the objects to export. On the Geo-Reference page, use the controls to transform the coordinates of the drawing data to geographic coordinates. How do I
ArcGIS – how to join attributes of overlapping polygons
Geographic Information SystemsHow do I merge overlapping polygons in ArcGIS? Merge existing features On the Edit tab, in the Features group, click Modify . Expand Construct and click Merge . Click the Existing Feature tab. Click Select. In the pane, add or remove features from the selection. Configure the attributes fields and field values for the merged
QGIS inherent attributes
Geographic Information SystemsWhat are attributes in QGIS? The attribute table displays information on features of a selected layer. Each row in the table represents a feature (with or without geometry), and each column contains a particular piece of information about the feature. Features in the table can be searched, selected, moved or even edited. How do I
Arcpy search cursor not working
Geographic Information SystemsWhich Arcpy module gives you access to cursors? da, a Python module in ArcGIS 10.1 for working with data. The module allows control of edit sessions and operations and improved cursor support and performance, provides functions for converting data to and from NumPy arrays, and supports versioning and replica workflows. What is a search cursor?