All Questions

0
votes
1answer
21 views

Sentinal NDVI Time series Chart and CLassification

I am working on NDVI time series analysis using Sentinal data and also classifying the data it will give some error and not working and how can i get the chart of three different features in ...
0
votes
0answers
22 views

Getting Details of POI

I am pretty new with this so please bear with me. I am able to extract GeoJSON data from OSM and Load it into MongoDB. I am able to run queries to get the data based on Radius. The data looks ...
2
votes
1answer
16 views

Geometry by expression in QGIS Modeller

I want to use 'Geometry by expression' in a model I'm working on but I couldn't figure out how to pass the layer name parameter. Basically I have two polygon layers (A and B) and I want to do a ...
0
votes
0answers
15 views

Zoom level for data capture for 1:50000 Map Scale [on hold]

Is there any specific zoom level at which I can capture the details such as building outlines, road edges etc. precisely for 1:10000 map scale? I am using a 50cm image to capture features. Is there ...
0
votes
0answers
22 views

No layer available in the response of GetCapabilites requset

I am doing a GetCapabilites request on geoserver to get the bounding box of wms layer but in the response, i am only getting a bunch of EPSG projections but no layers? this is the request i am using: ...
0
votes
0answers
14 views

Understanding Scale in Earth Engine

I am trying to understand the scale parameter in earth engine better. My goal is to calculate monthly sums of precipitation across a geometry. Here is the python pseudo code: area = ee.Geometry....
3
votes
1answer
52 views

Calculating distance between points within grid polygon

I'm very new to ArcGIS, and I would like to calculate the average distance between points within a grid for every grid. Is there any idea on how to implement this? My data look like this
-1
votes
0answers
11 views

Transportation map of a Country [on hold]

I am preparing a concept plan to prepare transportation map for my country. The chosen map scale is of 1 million. I want to show public transport access and air-routes with road network. Can you ...
0
votes
1answer
25 views

Calculate the target point by using initial coordinate, bearing angle and distance

I need to calculate the target coordinate by using the initial coordinate, bearing angle and distance. I came across this on how to calculate it. Then I construct the code in C#, but it seems I can't ...
1
vote
1answer
42 views

ST_Intersect PostGIS [on hold]

I’m a beginner with POSTGIS. I’d like to know if it’s possible to use Count or “>” with ST_Intersect. Precisely my question is : Which districts sit in 3 neighbourhoods ? SELECT district.name FROM ...
0
votes
0answers
19 views

Download GEE Image Based on Boundary of Feature Collection in Python [duplicate]

In Google Earth Image I'm trying to download an image using the boundaries of a feature collection using Python. Working off this example, in 'region' I want to specify a feature collection instead ...
1
vote
2answers
45 views

Missing checkbox when selecting layers using QGIS?

I'm an absolute beginner to QGIS. I'm trying to select BRUNSWICK_1106_TreeTops.dbf as a layer, but it does not have a checkbox in front of it as the DRUHIG_0096.tif. How can I get the checkbox in ...
0
votes
0answers
15 views

Updating field in attribute table based on values in another field [on hold]

I am working in Visual Studio to create script tools that will run in ArcGIS Pro. I am trying to populate a newly created field (Field2) in an attribute table based on the values from another field (...
0
votes
1answer
17 views

Checking if borders of layers match using ArcGIS Desktop?

I have two shapefiles which are made out of polygons within one city. Districts Parishes I need to check if their borders within the city match- if the parishes are within districts or if they ...
0
votes
0answers
10 views

Using Python / ArcPy to activate feature in one of ArcMap toolbars?

I'm writing a basic python script that will change a definition query and export. That is simple enough, but I would like to also add these arrows that only show up when you manually check a box ...
4
votes
1answer
26 views

QGIS: Batch convert of viewer styles from QML to SLD

Until now I was saving styles in QML files. Now I need them in SLD to be used in GeoServer. Is there a way how to perform a batch convert?
1
vote
0answers
5 views

Midvatten plugin - ERROR when importing csv file

I am trying to import csv files of water levels and stratigraphy but it's difficult. I get the message (see image of the first step): INSERT OR IGNORE INTO obs_p_w_lvl (geometry, obsid) SELECT (CASE ...
0
votes
0answers
15 views

Switching Between GCS & PCS in a Data Frame For Accurate Acreage/Distance Measurements

I'm working with a data frame that contains multiple layers; data frame and layers all use a GCS (WGS_1984). On one layer in particular, I want to be able to draw and measure the acreage of polygons. ...
0
votes
1answer
10 views

How to specify GPKG Driver in GDAL/OGR under C++?

We have run up against the 4GB shapefile (dbf) limitation in our Monte Carlo model. We've decided to switch to GeoPackage to output our point attributes. I cannot find a reference on what GDAL/OGR ...
1
vote
0answers
23 views

Get lat/long given current point, distance and bearing

While searching the web, I've encountered the following formulas for calculating the destination point P2's location given the source point P1 = (lat1,long1), the distance from it & the bearing: ...
0
votes
1answer
14 views

Error 43 using openlayers, Geoserver, and WMTS

When attempting to use the WMTS tile service with Geoserver and openlayers I keep getting error 43 (Expected layers to be an array or an ol.Collection.). I am new to openlayers so the issue is likely ...
1
vote
1answer
17 views

Identifying selected feature using PyQGIS?

If I select a feature and run self.iface.actionIdentify().trigger() it will open the identify window but won't open the selected feature's data, how can I make it open the data of the selected feature?...
1
vote
0answers
22 views

Moving Multiple Points Into Single Polygon using ArcGIS Desktop?

I have several days worth of geotagged imagery to which I've attached a tree canopy mortality rating. The goal is to eventually join all of these classifications to a shapefile that contains ...
2
votes
1answer
36 views

How to create a polygon from a data CSV file with coordinates using QGIS?

Having the following information in a CSV file: I want to build a polygon with all the points where the Group name is the same. For example I want to join all the points where the group is T101 and ...
0
votes
0answers
12 views

How can I assign colors based on attributes using Python in QGIS?

Very new to the environment. I have the .shp, .shx and .dbf files. I want to go through every element on the screen and change its color based on whether its 'Area' attribute is < 10. How can I do ...
0
votes
0answers
12 views

Is it possible use QSWAT in Ubuntu? [duplicate]

I'm looking for a way to run SWAT in QGIS, but my operational system is Ubuntu. Is there a manner to accomplish this?
1
vote
0answers
13 views

Getting rid of qt.qpa.plugin Error?

I am trying to execute standalone python script outside QGIS. But when I try to initialize Qgs Application , it give me below error . I don't have any idea how to get rid of it . from qgis.core ...
2
votes
1answer
16 views

Unrecognized argument type to convert to a FeatureCollection:

I am unable to chart a histogram for my region for each image in an image collection. // Create clipping function var clipper = function(image){ return image.clip(geometry); }; var modis = ee....
0
votes
0answers
11 views

Export image for documentation

I want to export my classified image to drive in GEE, for presenting in a document. I have used this code. Export.image.toDrive({ image: classified, description: 'classified_basin_with_points'...
1
vote
1answer
24 views

Question on how to identify (incorrectly tagged) bicycle routes from OSM

My workmates and I are trying to use OSM data about bicycle routes and other touristic infrastructure for the assessment of cultural ecosystem services. First, we compared the OSM data to official ...
0
votes
1answer
22 views

Converting CSV with LineString into shapefile using ArcGIS Desktop?

I have a CSV which I've imported into ArcGIS Desktop, and it contains a Linestring column. How do I convert it into a shapefile? Example of what one of the fields contain below: [[51.53878768021,...
1
vote
2answers
24 views

Reduce complexity of KML file

I have a 6mb KML file I am using with the Leaflet API/Ominvore plugin. It is just a centerline of a long distance trail. What would be the best way to make it smaller? Reduce complexity etc.
0
votes
0answers
20 views

Using Compressed Data Files (.cdf) from a Geodatabase in QGIS?

I am using QGIS3 for a file geodatabase that was created on ArcMap. I can only access a few of the layers in the QGIS browser because most of them are stored using a compressed data file (.cdf). When ...
1
vote
1answer
19 views

ETOPO1 upsampling issue

I am using the OSGeo4W Shell with the ETOPO1, 1 arc-minute global bathymetric data (etopo1_ice_g_f4.flt). I am cutting 256x256 pixel slippy map tiles, and am having a problem with getting smooth-...
2
votes
1answer
45 views

ST_Transform not working locally

I am using PostgreSQL 9.6 and PostGIS extension 2.4.4. On my machine, I get an error while running ST_Transform query: SELECT ST_Transform(ST_SetSRID(ST_MakePoint('27.9252', '-26.0987'),4326),32619) ...
0
votes
0answers
16 views

NHGIS census files get lat/lon from polygon

I've never worked with shapefiles before and I'm having a lot of trouble with something that I think should be pretty simple. So I have the census tract files from NHGIS for 1980 and the structure ...
0
votes
2answers
39 views

Getting hightest and lowest points

I have GeoJSON files that contains altitude values. I have used these GeoJSON files to be shown on leaflet.js web map. I need to show values of highest and lowest point in two divs when I clicking on ...
1
vote
1answer
21 views

Choosing method for labeling graduated data that is space efficient? [on hold]

Could someone recommend the best standard approach to labeling graduated data ranges? I was thinking of the following but would like to know if this is industry standard: Less than 0 >0 - 100 &...
-3
votes
0answers
11 views

Discrete Global Grid Systems : implementation examples? [on hold]

As part of a Discrete Global Grid Systems (DGGS) ‘s state of art, I have to analyse some land and marine oceanographic use cases. That’s why I venture to write to you and ask following questions. ...
2
votes
1answer
18 views

What is the difference between .filterMetadata(), ee.Filter.lte() and .sort() in google earth engine?

I am currently trying to obtain images that have less than 70% cloud cover (for example) and I have come across multiple variations of the same. Could you tell me what is the difference between these ...
0
votes
1answer
13 views

Ordering symbols in GeoServer using SLD with rendering transformations

I have been following this post-Is there a symbols level option/solution for SLD? about stacking symbols but I have been stuck in using <FeatureTypeStyle> with GeoServer rendering ...
1
vote
3answers
50 views

Perfect circle buffer on QGIS Madeira 3.4

Working on a road junction I would like to make a perfect rounded circle buffer of 1 km around this junction in QGIS 3.4. Here is what is look like now.
3
votes
1answer
80 views

Custom function works in “Zoom to Features” but not “Select Features”

I'm trying to update the Using Custom Functions tutorial to QGis 3 and Python 3 and I've run into an interesting issue. With the following code I can create an expression GetUtmZone()='33N' and it ...
1
vote
1answer
20 views

QGIS 3: How to rename attribute/field names for Geopackage Layer

Issue: I need to rename several attributes/fields in a geopackage layer. How to do this? Linked Issue: there are numerous pages on how to rename the attributes/fields of a shapefile. However there do ...
1
vote
0answers
12 views

Using GRASS in Python script QGIS 3

I am creating a Python script in QGIS 3 and I want to use the processing module. I want to transform my raster file to a vector file with the GRASS algorithm r.to.vect. My problem here is that the ...
0
votes
0answers
16 views

How do I add a georeferenced JPEG with a JGW Worldfile to OpenLayers v5.3.0?

I have a JPEG file with an associated .JGW worldfile containing the following data: 0.0144218 0 0 -0.0144218 -65758.8265181 -130841.5565499 My Jpeg is 21177*14242 pixels resolution. I'm currently ...
1
vote
1answer
20 views

Naming exported features from attribute information?

I am new to Python and in the process of learning. As a self test I am trying to export all of the municipalities of a single county feature layer as their own feature layers. I am trying to name each ...
1
vote
1answer
21 views

CORS issue loading an external local GeoJSON into OpenLlayers 5

I have a local folder on my network with my HTML file and two subfolders, one with the downloaded folder from OpenLayers (renamed ol) and the other with my GeoJSON file (data). When I try to load the ...
0
votes
0answers
14 views

How do I get TIFF asset of historical images to my drive?

I have loaded Landsat 4 TOA images. I added a table for my region of interest then I clipped it. Now I want to export the clipped image to my drive. But this error is shown in the task bar whenever I ...
0
votes
2answers
17 views

GeoServer SLD subquery in WHERE clause

I have this SQL request select name from osm_places where name in (select capital_city from osm_places where capital_city != '') Is it possible to write such a request in < ogc:Filter> section? ...

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