Questions tagged [normalize]

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Normalize county coverage data by population

I have point data where the result is either in coverage or out of coverage. I know that we receive far more in coverage results in high population areas, so I want to normalize the data by population....
ANW225's user avatar
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2 votes
1 answer
759 views

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 ...
Isa's user avatar
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2 votes
1 answer
143 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 ...
zaguy22's user avatar
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2 votes
1 answer
119 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 ...
Marlot Rijkers's user avatar
2 votes
1 answer
2k 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 ...
JLR's user avatar
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0 answers
56 views

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 ...
mikeLdub's user avatar
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2 answers
1k 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 ...
user123's user avatar
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3 votes
0 answers
43 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 ...
Eva's user avatar
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0 answers
154 views

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 ...
Javier Hernández's user avatar
0 votes
1 answer
621 views

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, ...
adwiputra's user avatar
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1 answer
823 views

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 ...
Python Lover's user avatar
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1 answer
530 views

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 ...
Adi's user avatar
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2 votes
1 answer
158 views

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.
Adi's user avatar
  • 327
2 votes
1 answer
467 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 ...
Alya Nasir's user avatar
2 votes
1 answer
329 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 ...
candelas762's user avatar
2 votes
1 answer
557 views

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 ...
brienna's user avatar
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1 vote
1 answer
257 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 ...
ihb's user avatar
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2 votes
1 answer
486 views

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 ...
Ray J's user avatar
  • 539
2 votes
1 answer
363 views

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/...
Lucas's user avatar
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1 vote
1 answer
638 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 ...
Kyle G's user avatar
  • 41
2 votes
1 answer
302 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 = ...
Lucas's user avatar
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2 votes
0 answers
285 views

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. ...
cdcerv's user avatar
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0 votes
2 answers
298 views

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 ...
M. Sen.'s user avatar
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1 vote
0 answers
151 views

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 ...
M. Sen.'s user avatar
  • 21
1 vote
0 answers
218 views

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 ...
Thuan Sarzynski's user avatar
1 vote
2 answers
218 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 ...
Dinosca's user avatar
  • 117
1 vote
0 answers
271 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 (...
nora's user avatar
  • 131
4 votes
1 answer
384 views

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 ...
Robert Buckley's user avatar
0 votes
1 answer
2k views

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 ...
RK4gis's user avatar
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1 vote
0 answers
64 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 ...
Li12's user avatar
  • 307
0 votes
0 answers
99 views

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'...
Sam's user avatar
  • 41
1 vote
0 answers
149 views

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, ...
nora's user avatar
  • 131
2 votes
1 answer
606 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 ...
ahmad735's user avatar
  • 133
3 votes
3 answers
572 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 ...
Luis Ramon Ramirez Rodriguez's user avatar
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: ...
Freeman's user avatar
0 votes
2 answers
683 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 ...
mondano's user avatar
  • 111
7 votes
3 answers
1k views

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,...
Ekdeep Singh Lubana's user avatar
1 vote
1 answer
110 views

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 ...
Cara's user avatar
  • 147
0 votes
1 answer
72 views

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 ...
reevesii's user avatar
  • 1,519
1 vote
1 answer
741 views

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 ...
MapPeddler's user avatar
2 votes
2 answers
1k 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 ...
Abbas Moradi's user avatar
6 votes
5 answers
22k views

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 ...
tda's user avatar
  • 531
2 votes
1 answer
558 views

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 ...
Todd Trimble's user avatar
2 votes
1 answer
327 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 ...
Rex's user avatar
  • 1,198
1 vote
0 answers
88 views

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, ...
Milo's user avatar
  • 137
1 vote
1 answer
514 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 ...
Dean's user avatar
  • 567
2 votes
1 answer
1k views

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 ...
Tadej's user avatar
  • 23
2 votes
1 answer
105 views

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 ...
Jithesh's user avatar
  • 23
1 vote
1 answer
1k views

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 ...
I Heart Beats's user avatar
0 votes
1 answer
8k views

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). ...
user706838's user avatar