Questions tagged [formula]

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6
votes
1answer
44 views

Find out what Expression has been used to populate an attribute column in QGIS

I need to find out what expression has been used in the field calculator to populate a number of columns in the the attribute table in QGIS. Does anyone know how to get it to display this info? Like ...
3
votes
1answer
60 views

Calculating polygon attribute based on intersection with grid in QGIS

I'm trying to use QGIS to profiling polygons in a layer. There is also another grid layer, each grid contains its own demographics information. Assume the demographics are evenly distributed within ...
4
votes
3answers
204 views

Calculating attribute with formula in QGIS

I want to build a QGIS formula where I calculate one attribute from 10 others, and I only need to sum them up. My Problem is, that I don't get the actual values of the attributes. I thought about ...
0
votes
1answer
55 views

What are the formulas used in SAGA Ordinary Kriging?

can some one name the formulas avaible in the Ordinary Kriging Modul of SAGA: What ist the exponential, spherical, Gaussian-Model, etc.?
2
votes
1answer
90 views

Flow data distribution within features of overlapping layers

I want to improve/adjust/comprehend the formula (see below) that was used in my previous question: Transferring flows (connections + values) between polygons for calculating flow values of mobile data ...
2
votes
0answers
73 views

Conversion to_string provides NULL in QGIS

I've been trying to convert a decimal row into a string row using a few methods. Below is my CSV file: also, note that csv header has been updated too, State;AverageRainfall;ProbabilityBelow;...
1
vote
0answers
332 views

Converting Google Maps Lat Long to Square meter area

I want to convert a set of 5 Lat Long (Directly taken from Google Maps) into Sq Meter area. As 5 points are there I have found the formula on Converting Longitude and Latitude Coordinates to Square ...
0
votes
0answers
21 views

How to find specific bearing, distance and elevation of a satellite [duplicate]

I am trying to find a specific bearing, distance and elevation to a satellite. I know there are websites but I need a formula to do this. I need to be able to find these things from a set of co-ords ...
2
votes
0answers
128 views

QGIS: processing-modeler to add multiple layer name to attribute field

I'm trying to add layer name using the field-calculator in QGIS (3.4.1). If I do this manualy it works fine, but if I do this using the processing-modeler I get NULL for every field. I just type @...
0
votes
1answer
167 views

Formulation of CRS (EPSG2438 to EPSG4326) conversion in Excel

I have about 14000 points with coordinates EPSG2438 and want to convert the coordinates into WGS84 (EPSG4326). I want to know that is there a way to make Excel formula to convert these coordinates. In ...
2
votes
0answers
318 views

Finding center of circle given three points?

I have been trying to solve this problem for quite some time, but can't find a good solution. Given three sets of geographic coordinates how can I calculate the center point. By "center point" I mean ...
0
votes
1answer
373 views

What is the Formula to get an Image's Bounding Box from it's GDAL GeoTransform Array?

I have a process which needs to read in an Image's GeoTransform Array, and convert it to the Bounding Box i.e. If the Input is: <GeoTransform> 7.8087700868360430e+05, 9.9974951285737870e+...