Questions tagged [maximum]
The maximum tag has no usage guidance.
21
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Selecting the maximum value from series of polygons that intersect with line in QGIS
Is there a way to select the cell (single) with the maximum value in a polygon layer using the intersection of a line? The first image is the grid (polygon) layer with the attribute field "VALUE&...
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1
vote
1
answer
72
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Google Earth Engine - Get Image with highest max Scene NDWI
By adapting code from Getting Image with highest max Scene NDVI from Image collection using Google Earth Engine I have been able to make a script that gives me the date and mean highest NDVI for each ...
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1
answer
71
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Finding maximum value on raster transect between two points using PyQGIS
I have a raster layer and two points with their coordinates, and I want to find the maximum raster value on the line between these two points.
Is there a built-in function in PyQGIS to find the pixel ...
- 336
1
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1
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110
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Google Earth Engine - Get Image with lowest NDVI from a time period
One of the answers to this question (Google Earth Engine - Get Image with highest max Scene NDVI from a time period) provides code which gives a Sentinel image/date with the highest NDVI for each ...
3
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2
answers
193
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Getting polygon with max attribute within polygons with same geometry using GeoPandas
I have a GeoDataframe containing the spatially joined result of a square grid map and flood hazard data. However, there are instances of rows with the same "geometry" but differing "...
- 69
5
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1
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169
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Creating longest line within polygon that crosses point
I am performing a morphometric analysis of dolines using QGIS. I want to generate longest axis within basin polygon that crosses the lowest point (from other layer) of basin. Is there a way to ...
- 81
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5
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687
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Returning column name of the max value in QGIS
I am working with some age group data in QGIS based on point counts within a polygon grid and I would like to calculate the max value from a row with 11 different age groups in order to get the ...
- 71
5
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2
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363
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Selecting features by expression with SQL syntax in QGIS
I have a table (shapefile) in QGIS where I want to select features that satisfies this condition:
group by a field ("join_label") and within the "grouped field", pick the attribute ...
- 131
6
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2
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346
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Finding the longest horizontal line inside polygon in QGIS
I have a state polygon like the pic shown below, is there a way to find the line which is the maximum horizontal line?
Like this, but I want the maximum distance line.
- 79
2
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1
answer
31
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Replace a field with maximum of it's attribute values based on values repeated on another field's attribute values using ArcPy
So I have performed Spatial Join between a point and line feature class. Now for each point there are several lines. What I want is the maximum count of line features as an attribute value in the &...
4
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2
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234
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Using max function to group max value by unique ID in QGIS
I have been using the maximum function to group max value by unique "id";
maximum("Ni_ppm_1", group_by:="Hole_id")
The function pulls the maximum "Ni_ppm_1" ...
- 61
2
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181
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Getting maximum value of measured values every xx meters
I have huge CSV files from measurements (most of them are done by car), like this:
measurement file
The measurement system record one value every second and save this together with the GPS coordinates....
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6
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1
answer
239
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Placing point over pixel with maximum value falling in grid overlay using QGIS
I have a raster layer with a Shapefile grid with cells measuring 3 x 3 m overlaid on top. All I want to do is find the pixel with the maximum value within each cell, and place a Shapefile point over ...
- 187
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1
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72
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Getting maximum distance for point features in the same point group
For each group I want to find the maximum point-to-point distance (and which of the id1 features participate in the max).
For example, if I have the following attribute table:
FID Long Lat id1 ...
- 901
1
vote
1
answer
92
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Showing only maximum value for each point feature
I have a dataset with concentrations of copper from different stations taken over several years. I would like to show only the highest concentration "mikromolar" for each station "STATN&...
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3
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Finding longest straight line within polygon in QGIS
I'm looking for an algorithm to draw max distance straight lines contained in a polygon (without crossing polygon boundaries). How can I perform it?
As you can see some polygons are very oddly shaped.
...
2
votes
2
answers
554
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Google Earth Engine - Get Image with highest max Scene NDVI from a time period
I have a shapefile with several fields, corresponding to different wheat fields of a certain year. Using as Input an image collection converted to NDVIs, I would like to calculate the mean NDVI value ...
- 125
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4
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3k
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Calculating the longest distance within polygon in QGIS
I want to calculate the "diameter" of polygons in QGIS.
The "diameter" defined as the distance between the two most distant points of the polygon.
I couldn't find a fitting solution in the field ...
- 245
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4
answers
3k
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Maximum value of field of vector layer using PyQGIS
If I have a vector layer in QGIS, how do I use Python to find the maximum value which a given field has?
I need to convert the values in one field into values between 0 and 1. I guess I therefore need ...
- 5,592
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3
answers
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Using 'max()' in expression with QGIS
I want to make a rule-based style on the maximum value from a field. I set my expression like:
max("fieldname")
It returns every value instead of only the maximum one.
Can anyone tell me ...
- 5,109
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Determining the longest side of polygon in QGIS
Is there a possibility to determine the longest side of a polygon with QGIS?
As I need to do that for hundreds of polygons I would prefer an automized method (like a plugin).
So far my idea was:
...
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