Questions tagged [data-collection]

For questions related to the collection of geospatial data.

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How to lower the pixel quality in Sentinel5P-CH4?

I'm working with CH4 product Sentinel-5p provided by ESA Copernicus. I need to change the pixel quality. Currently, GEE only data are used with a quality assurance value (qa_value) > 0.5, but that ...
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1 answer
50 views

Error while Iterating a Composite Image Collection over PCA analysis

I have created a composite image of Landsat 8 from the year 2014 to 2020, these are stacked images for summer season. Now while applying PCA analysis and extracting a particular band it is showing an ...
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2 votes
1 answer
444 views

How to scrape/extract data from Esri ArcGIS from website

I was trying to extract data from an ESRI map embedded in a website. The objective would be by introducing geographic coordinates to be able to access the values ​​present on the map. I leave here a ...
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1 vote
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63 views

Getting altitude with Trimble TDC 100 and QField

In our company we got Trimble TDC 100 and install QFlied for data collection. We collect points and polylines. Our aim is to get vertex and points while saving their altitude (height above the mean ...
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1 answer
106 views

How to average data from Sentinel-5p collection ignoring zero?

I am working with CH4 product Sentinel-5p provided by ESA Copernicus. Remote User Support provided a script to extract averaged CH4 anomalies for a certain period for the Earth Engine. However, I ...
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1 vote
1 answer
78 views

Filtering image collection - only one image from a certain date

My code generates an image collection. In the collection, there are multiple images from the same date (probably from different tiles). Is there a way to filter it and get only one image from a ...
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1 vote
0 answers
26 views

Get an average image, but the time of each pixel is different

Change image is an array image,he stores the time node of each pixel.time1 and time2 are the first node and the second node of each pixel, respectively.I want to get the NDSI average value of each ...
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  • 109
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1 answer
456 views

How to apply a Bitmask for radiometric saturation QA in a image collection (earth engine)

I am new to earth engine and I am trying to apply a radiometric saturation mask in a image collection based on ''radsat_qa'' in earth engine data catalog for landsat reflectance tier 1. I am trying ...
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1 answer
36 views

Image collection images to a 1D vector where there is one value corresponding to each image

I am currently working with MODI's land surface temperature image collection dataset of 20 years of data. I want to convert each image to a single value representation using mean/max function. I tried ...
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1 answer
753 views

Google Earth Engine: Multiply an image collection by a different number depending on the month

I am trying to multiply a monthly imageCollection by a different number depending on the month. What I want is to multiply all the pixels of the first 12 months by 0.85, the following 12 months by 0....
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43 views

What is the highest spatial resolution for coronavirus cases?

I understand that the JHU CSSE Dashboard became the watering hole for public health professionals and data science enthusiasts alike, and it visualizes the spread of novel coronavirus (SARS-CoV-2) ...
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  • 379
-1 votes
1 answer
27 views

Prepopulate survey forms with unique coordinates [closed]

I want to do a survey using ODKCollect or similar, whereby for each form, my interviewer is directed to a predefined unique point, to collect detailed data about it. The idea is to collect information ...
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3 votes
1 answer
670 views

Differences and thresholdis of ImageCollection in GEE

I have the following code (very basic as I am new user), and I want to create an NDVI difference collection by subtracting every NDVI image from my initial collection, with its previous one (something ...
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  • 186
2 votes
1 answer
2k views

Getting weekly mean composite in Google Earth Engine?

I am currently working on a time-series in Google Earth Engine. Iam still quite inexperienced, especially when it comes to functions. I want to extract the mean values of Sentinel1-images for each ...
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  • 23
3 votes
1 answer
1k views

Google Earth Engine: How to avoid gaps in date-wise image mosaicks?

This question is a follow-up to the excellent answer of Rodrigo E. Principe here: Mosaicking a Image Collection by Date (day) in Google Earth Engine I am trying to apply the suggested code to gather ...
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1 answer
872 views

Apply a mask to multiple images(for same geo location) in a image collection

I have a image collection which holds multiple images of the same area. I can apply mask individually to those images but how do I apply a mask to all the images in the collection. Say the mask i have ...
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  • 101
2 votes
1 answer
1k views

Data collector mobile app with mapping capabilities [duplicate]

At work we have a GIS solution platform with 50+ GB of data in a Postgres cluster. Almost all tables have spatial columns. We have several clients consuming this information for different needs. I'm ...
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2 votes
0 answers
113 views

Outline overview for available datasets in QGIS

Assuming you have several 100 000 files on your discs which are all georeferenced which are all readable within QGIS (Raster maps, sqlite maps, vector maps, shapefile etc.) After 20+ years in ...
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  • 149
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1 answer
431 views

Google Earth Engine: Stack an ImageCollection

Does anyone know how can I stack all this collection? I made my own collection from January Landsat images (L7 and L5) and I would like to stack all the images to check which are the areas with more ...
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  • 373
4 votes
1 answer
3k views

Field data collection for QGIS? [closed]

I'm new to the open-source GIS world, having abandoned ArcGIS due to costs, and am looking for an OS analog to the Collector app. What I'm seeking to do is collect field data with an Android cell ...
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5 votes
1 answer
2k views

How to apply a Cloud Mask in a collection?

I am trying to apply a mask cloud in a SAVI collection (LANDSAT) to get a chart with time variations between pixels. var region = table3 Map.addLayer(table3) var col = ee.ImageCollection('...
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  • 373
0 votes
2 answers
199 views

ESRI Collector app- Offline record collection limit

I am wanting to find out what the maximum number of records people have collected while being offline on the ESRI Collector app. I am operating on an Ipad with a 64 GB capacity. Has anyone load ...
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5 votes
2 answers
3k views

"Batch processing" data of multiple ROIs in Google Earth Engine

I have written a rather simple script for data selection and subsequent export in GEE: //Create region of interest -> Should be replaced by manual selection of ROIs or ROI center points and ...
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  • 1,076
1 vote
0 answers
210 views

Field data inspection and collection using GeoODK?

In my workplace we are looking at collecting and inspecting GIS data using free mobile apps. The one that is fit-for-purpose from a data collection point of view is GeoODK. I have been able to prepare ...
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  • 542
1 vote
1 answer
128 views

Collecting offline spatial data on iPads? [closed]

I a looking for an iOS app or any approach, that will allow me to do offline map-based surveys and upload the data back to one single database once I am online (like the Esri Collector), but: in ...
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-3 votes
1 answer
127 views

Acquiring data of Billboards on USA [closed]

I have this task on ArcGis consisting on retrieving landownership data of every billboards' in USA, etc... from where should I start ?
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9 votes
5 answers
8k views

US ZIP Codes +4 By State or County- Shapefile (or table/dbf)

I am looking for Zipcode data with the +4 digits at the end for a City (I can use it by state and clip the points to my municipal boundary), and with edges or geocodes. I called the post office and ...
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3 votes
0 answers
688 views

How to read NMEA message using GPSD? [closed]

I am trying to read NMEA messages via GPSD (http://www.catb.org/gpsd/), but I do not know how to do that. I have a GPS antenna which connects to the u-blox M8 GNSS Evaluation Kit Timin (https://www.u-...
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0 votes
1 answer
68 views

Form Creation for use in ArcMap [closed]

I am using ArcMap 10.2. I am trying to create a form to use in the field (on a construction site). This form will be used to inspect features such as a inlet. My main goal is to have the ...
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  • 574
2 votes
0 answers
251 views

Obfuscating location? [closed]

I have a webservice where I have one solution to obfuscate location called Points of interest which are predefined points scattered around an area. When ever a user send their coordinates from their ...
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3 votes
1 answer
2k views

Arc collector: cannot enable offline mode for map

I am trying to setup arc collector for offline data collection in remote areas. I have followed steps from a few ESRI tutorials. Problem: when I try to "enable offline mode" for the web map within ...
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2 votes
0 answers
231 views

Trimble Access vs. TerraFlex: Which is simpler for creating data entry forms? [closed]

I am working on an archaeological project and need to create forms for users in the field to use and take photos. I am renting a Trimble GNSS unit and can get Trimble Access for free with the unit, or ...
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2 votes
1 answer
103 views

collect location via form [duplicate]

I'm trying to find if there is some solutions for collect data from users via some easy form (not google forms, something more powerful)? I heard about arcgis collector, but you have to log in (so ...
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1 vote
0 answers
90 views

How can I draw points on my mobile and then pass it to my computer? [closed]

we are doing a survey to know how many people still use outside bathrooms in the Caribbean, I want to go house by house using a shapefile image on mobile and point the location of points of interest ...
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5 votes
1 answer
2k views

Button to run Python Script on Custom Form Open QGIS

I'm very new to QGIS and Python (although years ago had some programming experience with C++), but have been muddling through with a fairly large project cataloging cemetery plots at the moment. I ...
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1 vote
0 answers
128 views

Points to Path does not work [closed]

I have a data set from a collard animal separated by days, I want to create an individual line from each day of data to know how the animal has moved in the forest. When I use the plugin points2path ...
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2 votes
2 answers
469 views

Is there an easy way to read output from Open Data Kit in QGIS?

I use Open Data Kit (ODK) to do field collection of points of interest. ODK outputs each collected point as an XML-file with a structure like so: <?xml version='1.0' ?> <data id="...
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  • 2,486
0 votes
1 answer
182 views

How to sequence points for GPS collection?

I have a large number of points representing assets that I need to field verify. Their unique IDs reflect when they were created, which is not a good indicator of how close they are to each other. ...
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1 vote
0 answers
133 views

How to get users click a map (OSM) and collect location data plus parameters?

I wonder if there is a simple service out there on the web that allows to collect location data from users easily. A click on a OSM map should give the location, then a form to collect a comment, ...
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2 votes
1 answer
81 views

Recast data from one geographic standard to another

I'm working right now a project looking at medical labour supply in rural areas in Australia. I aim to use STATA for most of this analysis, but a change in geographic standards by the Australian ...
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  • 21
2 votes
2 answers
789 views

Trimble Pathfinder Differential Correction: ‘Uncorrected’ for block of GPS data

I’ve been collecting GPS point data without problems over the last few months. Recently, on two dates, after using Pathfinder differential correction, the exported records’ Corr_Type changed from ...
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  • 21
0 votes
1 answer
173 views

Participative maps for collecting geographic information? [duplicate]

I'm looking for a simple way to collect information for a participative plans (regarding landscape) and show them on Google Maps. I'm thinking to a small web form for asking information to public (es:...
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  • 489
1 vote
1 answer
239 views

Protected general and admin settings in GeoODK app

I was wondering how to prevent the user to change the general and admin settings of the GeoODK (android-collect)? I mean to be protected with a password, for example. I've tried to go to settings > ...
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  • 33
2 votes
1 answer
1k views

Getting started with RTK base stations

My employers are looking into a partnership with a company that provides RTK base stations (they specialize in Topcon equipment) and are planning to replace our old total station with a Topcon HiPer ...
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  • 73
0 votes
2 answers
91 views

Is it possible to append the same type of shapefile captured on two different Trimble Juno 3b's with ArcPad 10?

I will soon have access to two Trimble Juno 3b's which will both have ArcPad 10. I have done some practice with one Juno 3b and I am very confident with my ability to use them. All I need to know is ...
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1 vote
0 answers
154 views

Collecting and editing local data on a tablet?

I need to view, collect, and edit data that has to be stored locally on an iPad, though we may be able to get an Android tablet if that's the OS with a solution right now. This data cannot go through ...
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2 votes
1 answer
2k views

How to change ODK GPS accuracy threshold?

I am using ODK with ONA in XLSForm. As the GPS accuracy default is 5 meters, it automatically accepts it when it reaches 5 meter. Is it possible to change the default accuracy to less than 5 meters (i....
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  • 323
3 votes
1 answer
130 views

Data Collection Solutions

I am seeking a new data collection software for a team of biologists who track migrating animals from planes through aerial telemetry. I currently use Delorme TOPO USA but when collecting point data ...
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  • 139
4 votes
1 answer
475 views

Collecting polygon features from many people with simple online form? [closed]

I work at a transportation consulting firm that works over a large geographic area with dispersed offices. We'd like to develop a database of the locations of our projects, so that we can easily find ...
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1 vote
0 answers
3k views

ArcGIS Collector on Android failing to upload multiple features with attachments

I have a data capture map in ArcGIS Collector working correctly on a Samsung Galaxy Note 8 (Android 4.1.2) and a Samsung Galaxy Tab 4 (Android 4.4.2). I also have the same map working in the ArcGIS ...
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