Questions tagged [normalize]
The normalize tag has no usage guidance.
54
questions
2
votes
1
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219
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Numpy is not setting properly nan values: arr[arr== 0] = np.nan
I am creating a script to normalize a satellite scene.
My input image is of type float32, and no NoData value is assigned. However, during the normalization, I want to avoid using pixels with a value ...
- 61
2
votes
1
answer
47
views
lidR: "Argument is not a LAS object" when using catalog_apply
I am using the lidR package to read lidar data (LAZ format), then using clip_roi() and normalize_height() to process the data for the segment trees function. These functions are being executed within ...
- 33
2
votes
1
answer
76
views
How to combine two vector layers into one combined layer?
I made two layers for heat stress (PET) and flooding risk. I normalized both maps into a 0-100 scale. The number 0 means a low heat stress/flooding risk and 100 is a high heat stress/flooding risk.
To ...
- 103
1
vote
1
answer
893
views
Raster normalization
I have change my computer and I install QGIS on the new one. Now I can't normalise a Raster neither the LTR 3.16.16 nor the last one when I could with older 3.16.
I found that the problem is SAGA, or ...
- 171
0
votes
0
answers
41
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Summarizing global soil erosion raster data
Using ESDAC's Global Soil Erosion data which is 25km resolution with values representing metric tons lost per hectare per year. I'm trying to summarize by certain regions using ArcGIS Pro Zonal ...
- 1,173
0
votes
2
answers
782
views
Normalizing satellite image value to 0-255 using QGIS
I have a satellite image and I want to normalize the value between 0-255. I am using QGIS. I used this formula (NewRaster = ( OldRaster - -1 ) * 255 / ( 1 - -1 ) + 0 ) but it does not give me the ...
- 195
3
votes
0
answers
37
views
Empirical Line Method (ELM) in ArcGIS Pro [closed]
My images from 2017, 2018, 2019 and 2020 from the same area, recorded in the same time of the year, all look different regarding colour brightness, likely caused by atmospheric circumstances. As I ...
- 41
0
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0
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121
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Problems with tree height in CHM
I did a drone flight over a forest plantation and got the DSM and DTM. Later, I was interested in calculating the height of the trees within a plot. For this, I did a subtraction between the DSM and ...
0
votes
1
answer
462
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Normalizing Bands in All Images in Image Collection
I am trying to normalize the values in each band across images in the imageCollection I have filtered.
I tried running this here
var normalized_collection = l1c_collection
.filterDate(start_scene1, ...
- 123
0
votes
1
answer
639
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Normalization of stack of features in Google Earth Engine (GEE)
How to normalize a stack of features in the google earth engine? Features are the image type you can see the Javascript code here. I'm going to normalize features between 0,1 values.
Can you provide ...
- 13
0
votes
1
answer
442
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Standardization of layers formula
I am building a suitability map in which I have different vector layers and raster data, I have converted all my vector layers into raster and I am using these two formulas to normalize the ...
- 317
2
votes
1
answer
119
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Checking distribution of raster layer using ArcGIS Desktop
I am using ArcGIS Desktop.
How do I see if my layer has a normal distribution in order to standardize it?
I have calculated statistics, but have not been able to see how my data is distributed.
- 317
2
votes
1
answer
327
views
Explanation on band conversion from radiance to reflectance final value
I've watched few video on conversion of radiance to reflectance for landsat band, most of them recommended to use formula below to to make sure the final reflectance value lies in between 0 to 1. My ...
- 31
2
votes
1
answer
268
views
Nomalization error "Interpolation of X points outside the convex hull"
Recently I had to update my version of lidR from 2.3 to 3.0 and since then, the script I had for normalizing my files can not finish the process not even if I indicate opt_stop_early()<-FALSE. The ...
- 369
2
votes
1
answer
371
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Advice on normalizing census data in choropleth maps
I'm trying to figure out the best way to normalize census data in two choropleth maps showing the population of people with hearing loss. Their geometries:
The states of the United States.
The ...
- 240
1
vote
1
answer
209
views
Is the Enhanced Vegetation Index normalized?
I am trying to figure out if the Enhanced Vegetation Index (2-band) is normalized or not? My first guess is that it is, but due to a multiplication factor of 2.4, I'm not sure if it is or not. The ...
- 483
2
votes
1
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346
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For normalizing las files in a LAScatalog, is opt_filter() only used in the processing?
I'm using
opt_filter(ctg) <- "-drop_overlap -drop_z_below 0"`
ctg_norm <- lasnormalize(ctg, algorithm = knnidw(k = 10, p = 2), na.rm = FALSE, use_class = c(2L, 9L))
Are overlapping and ...
- 527
2
votes
1
answer
280
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lidR - lasnormalize error handling
When normalizing a lasCatalog, the processing stops early with the following error:
An error occurred when processing the chunk 22. Try to load this chunk with:
chunk <- readRDS("/tmp/RtmpdcuTUO/...
- 583
0
votes
1
answer
500
views
How to normalize elevation of GeoTIFF file data stored as unsigned integers?
I have a GeoTIFF file where the pixels are stored as unsigned 16 bit integers. I am using C# Gdal bindings to read the GeoTIFF file, using the Band.ReadRaster method, in order to produce an array of ...
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2
votes
1
answer
278
views
lasnormalize() is creating large negative values?
I am trying to generate a normalized height values for a catalog of las tiles. I first generated a dtm using:
dtm = grid_terrain(ctg, knnidw(k=5))
Then, I normalize the values using:
normalized = ...
- 583
2
votes
0
answers
209
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Charting Normalized Difference of Image Collection?
I would like to get the normalized difference of each image within an image collection (In this case Sentinel-2) for a specific polygon/geometry and then chart the values calculated for each image.
...
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0
votes
2
answers
259
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Relative Radiometric Normalization of multisensor Landsat Level 2 images using R
For my time series analysis, i need to use images of the three Landsat sensors (TM, ETM+ and OLI). I chose the already atmospheric corrected surface reflectance/Level-2 products. Due to the ...
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1
vote
0
answers
145
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Pre-Processing for multi-sensor Time series analyses based on Landsat Level 2 imagery
I downloaded TM, ETM+ and OLI Surface Reflectance Higher-Level Data Products (atmospheric corrected) based on L1TP Landsat images (radiometrically calibrated, orthorectified). I need to include images ...
- 21
1
vote
0
answers
197
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Conversion to normalized radar cross section of PALSAR data in Google Earth Engine [closed]
I am mapping deforestation driven by palm oil expansion in Malaysia.
I am using ALOS PALSAR data from JAXA available directly on Google Earth Engine. Those data are raw and I'd like to process them ...
1
vote
2
answers
173
views
Why reflectance map in pix4d dont are normalized
I want to know, why my reflectance map, dont have value between 0 and 1. Because my calibration table said me: for example red band has max value = 0.88 nm, and my reflectance map in red band have max ...
- 117
1
vote
0
answers
248
views
Normalization where the smallest grid value gets the biggest value with “rescale by function”
I tried to normalize a density analysis between 0 and 100 with the tool “rescale by function”. The tricky thing is now, that the smallest value out of the density analysis should get the value 100 (...
- 131
4
votes
1
answer
361
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Is the ground level cross section of a normalised lidar dataset flat? [duplicate]
If I normalise a lidar dataset I am (according to my thinking) simply subtracting the first return heights from the ground heights. Thus the resulting dataset will only contains the height above ...
- 10.1k
0
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1
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2k
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Normalizing a digital surface model? [closed]
I am trying to generate a normalized DSM by subtracting the original DSM (oDSM) from the DTM.
To generate the DTM I had to first use a median filter on the oDSM (remove noise) and then use a ...
- 101
1
vote
0
answers
53
views
Light normalization of Orthophotos to increase comparability
I would like to work with the RGB-values of different orthophotos. Now I noticed that the light conditions are not the same in the different orthophotos. I was wondering if there is a sound way to ...
- 307
0
votes
0
answers
77
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Correcting for correlation of kernel density of events to that of their distance from separate feature using ArcGIS Desktop?
I have a kernel density raster of recorded events. These events are correlated to their distance from a linear feature. In other words, density is higher near this line because it is a 'starting point'...
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1
vote
0
answers
145
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Comparing normalize options of ArcGIS Desktop?
I am wondering if the tool “rescale by function” is definitely doing the same than the raster calculator with the expression ("raster"-min("raster"))/(max("raster")-min("raster"))*100? (I guess so, ...
- 131
2
votes
1
answer
486
views
Creating filter stage of type filters.height using PDAL?
I use PDAL to find the height of points from LiDAR data. When I run the command:
pdal translate myfile.las height.bpf height --writers.bpf.output_dims="X,Y,Z,Height;"
It throws me the following ...
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3
votes
3
answers
571
views
Can USA streets have both, name and number?
I'm working normalizing list addresses using Tiger Geocoder normalizer and a python library, usaddress E.G.
For these two I have:
5121 33RD ST N
House_no = 5121
street_no = 33
1656 HABERSHAL DR ...
0
votes
2
answers
1k
views
Normalize and Results show as Percentage
I've Normalized my data and everything looks okay. However, its appearing (on my map legend and in the Table of Contents) as a ratio (Ex: 0.000-0.005) but I would rather it appear as a percentage (Ex: ...
- 1
0
votes
2
answers
670
views
Normalize geo coordinates from trips with several stops
Trips on the globe
I have a large number of trips, each containing one to five stops from origin to destination. Each stop is given with geo coordinates.
Target projection
I would like to transform ...
- 111
7
votes
3
answers
1k
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Why is a normalized parameter involving the Green band and Red band not used for Vegetation determination?
The green region reflects solar energy sufficiently well. So does the NIR region, much more than the green region, indeed. However, reflection in Green region is based on the chlorophyll concentration,...
1
vote
1
answer
95
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Standardizing number of jobs and sales per state for choropleth map?
I want to show the change in jobs and sales per state from 2006 to 2015.
Since I will be making a choropleth map, does this mean that I need to normalize the job and sales numbers before I make the ...
- 147
0
votes
1
answer
66
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Use of US Census data to plot house value range
The house value data from the US Census Bureau is provided as a table differentiating areas into census tracts. My understanding is that they categorize each tract into quantities of homes fitting ...
- 1,491
1
vote
1
answer
706
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Count points in polygon by attribute column for making choropleth
I have a point shapefile of complaints for NYC. I also have a polygon shapefile of community district boundaries with an attribute column for the community district number.
Is it possible to count ...
- 348
2
votes
2
answers
959
views
Can't normalize LiDAR point cloud with lasheight and -replace z (LAStools)
When I try to use lasheight with -replace z to normalize the point cloud, the height of points are changed (destroyed heights; see pictures below).
Without using -replace z everything is ok, but the ...
- 31
6
votes
5
answers
21k
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Normalizing raster using raster calculator in ArcGIS 10.3.1? [duplicate]
I have been trying to 'range standardise' or normalise my raster values from 0-100 and I know how to do this mathematically:
("raster"-min("raster"))/(max("raster")-min("raster"))*100
and I have ...
- 531
2
votes
1
answer
418
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What does the GEOS LineString "normalize()" routine really do?
What does the GEOS LineString "normalize()" routine really do?
GEOS has virtual void geos::geom::LineString::normalize() with the documentation:
A normalized linestring has the first point which ...
- 71
2
votes
1
answer
311
views
How to normalize Landcover criterian Map to 0-255 scale in Weighted Linear Combination?
I am interested to normalize Landcover raster image having 6 classess using fuzzy membership function (sigmoidal monotonically increasing) in Weighed Linear Combination (WLC) in the backdrop of MCE ...
- 1,178
1
vote
0
answers
87
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Normalizing raster data: getting a range of output values as opposed to a Boolean output [duplicate]
I converted a polygon shapefile which defined ED boundaries to raster. The value i based the raster surface on was a population count for each ED. The values ranged from 568 and 18160, as expected, ...
- 137
1
vote
1
answer
496
views
Normalize address query not working in postGIS
Okay, so I'm new at SQL, so bear with me. I'm trying to use the tiger extensions on postGIS (2.1.7) to normalize my addresses and then geocode them. The normalize query runs, but never returns an ...
- 567
2
votes
1
answer
1k
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Normalizing raster using raster calculator raises TypeError
In ArcGIS 10.1 I'm trying to normalize a section of a DEM (digital elevation model) from original values to values ranging from 0 to 100. First I clipped the raster DEM with an irregulary shaped ...
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2
votes
1
answer
99
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How to normalize choropleth maps of startups by state?
I want to display on a choropleth map the startups of a particular domain that operate in that state. I have a count of startups by state. How do I normalize so that the map is not represented ...
- 23
1
vote
1
answer
884
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Normality, Ordinary Least Squares (OLS) and Geographically Weighted Regression (GWR)
Most of the publications I have reviewed, conduct both OLS and GWR for comparison, and prior to analysis, ensure dependent and explanatory variables are normally distributed. Can someone explain why ...
- 389
0
votes
1
answer
6k
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Convert lat/lon into meters
I have a database of latitude, longitude and radius in the following form:
48180759,11518950,19.0
Both latitude and longitude are expressed in degrees but then multiplied by 1e6 (or 1000000). ...
- 109
2
votes
2
answers
4k
views
Converting LANDSAT-8 TIFF to matrix, data frame, or SpatialGridDataFrame formates
I need to correct the reflectance values of LANDSAT-8 data for steep terrain and find it too tedious and clunky in ArcGIS. The data I have is:
LANSDAT-8
DEM (ASTER)
Slope and aspect (Derived using DEM ...
- 121