Monitoring

PlanetScope Monitoring provides a medium-resolution, continuous, and complete view of the world from above, every day.

  • 41 Topics
  • 129 Replies

41 Topics

T
TiagoCC‎‎ 🌱
asked in Monitoring

Measure size of gathering/number of people

Hi, I’m a new user in Planet and I’d like to measure the number of people gathering for certain events in Mexico. What would be the best way of doing this?I know the date, time and location of events, which sometimes overlap with the timing when the satellite images are taken. I don’t know too much of remote sensing, but my idea was to measure the spatial distribution of image tone intensities, comparing images of a same location with and without the gathering.I’d appreciate if I could get any feedback on how to implement this! One of my questions is what is the appropriate meters per pixel that image that I should use? What is the minimum size of a gathering that I could detect?Example: I know that in this park (24.022724971695283, -104.67158198775181) there was a political gathering on June 21, 2018 around the time the image was taken. Hopefully, if there were enough people attending, I would be able to observe this, right?Thanks for any directions or suggestions!

0
T
9 days ago
Minh Nguyen
Minh Nguyen‎‎ 🌱
posted in Monitoring

Generate DSM/DEM from multiple PlanetScope images

Hello,I am study the topography change of mining site in Vietnam and wonder is there anyone experienced the DSM/DEM generation from multiple PlanetScope images? And comparison between stereo and multiple-images result for DEM/DSM. Although there are several scientific papers, there is lack of guideline to retrieve the high accuracy of DEM/DSM.  Thank you.

10
elyhienrich
Community Manager 🌎
16 days ago
B
barand‎‎ 🌱
asked in Monitoring

Urban indices for planetscope

Hello, I was wondering if anyone knows any good indices to use in urban landscape for picking out buildingactivity and not vegetation?

0
B
1 month ago
S
safalabolo‎‎ 🌱
asked in Monitoring

Change of spatial resampling

Hi folks!From the available documentationhttps://assets.planet.com/docs/Planet_PSScene_Imagery_Product_Spec_letter_screen.pdfI understand that the PlanetScope data is distributed with a CubicConvolution type resampling.I was wondering if a different choice, nearest neighbor resampling, was possible in order to preserve the original value of the image pixels.Thank

2
S
1 month ago
C
Codrut-Andrei Diaconu‎‎ 🌱
asked in Monitoring

Cloud masking with UDM for snow & ice regions

Hi! Has anyone insights into the quality of the UDM mask (clouds especially) for snow-covered regions?Below you can see an image (2017-08-01, 45.97N, 7.35E) with some glaciers & snow and the corresponding cloud mask from the UDM layer.You can notice: a lot of snow/ice areas are miss-classified as clouds  there is a line that separates the cloud mask into two sub-regions (the data comes from two different stripes); what's strange is that one sub-region has many more FPs than the other; looks like the algorithm behind is very sensitive to the underlying sensorI’m wondering if it is common that snow & ice are frequently classified as clouds. I’m more familiar with the Sentinel-2 data and there the masks usually manage to capture the difference between snow and clouds.Has anyone experience in this area?Thanks!

4
C
1 month ago
F
Frankdent‎‎ 🌱
asked in Monitoring

How do you balance the mosaic images?

I would like to know how to balance the mosaic images. I would like to do a classification but it seems like some images have the red value as twice of the other images, even those from the same day. Is there a color balancing I can do?  

0
F
1 month ago
Z
zzoligaszz‎‎ 🌱
asked in Monitoring

Data Download

Hi, I am new to Planet and am currently going through the tutorials, etc., but I have a quick question on data. I downloaded some imagery yesterday, but it wasn't quite what I was looking for. It came clipped and also complete as an RGB image. I was hoping for something more like you would get in Earth Explorer with a Tile covering the area and individual bands of imagery so I can do ratios and data fusion. Is this possible with Planet imagery? Thanks for any assistance or advice.  

1
A
Planeteer 🌎
1 month ago
R
rmant‎‎ 🌱
asked in Monitoring

Smoothing PlanetScope Raw Data to Eliminate Unusual Lines/Stripes

Hi, I'm currently working on estimating chlorophyll-a (chl-a) concentrations in large water bodies using PlanetScope raw data, enhanced with acolite atmospheric correction. However, I've encountered a consistent issue where some scenes exhibit unusual lines or stripes, which I suspect to be noise. This has happened across multiple data sets and seems to disrupt the accuracy of my chl-a concentration readings. Upon reviewing the PlanetScope data documentation (https://developers.planet.com/docs/apis/data/sensors/#the-psbsd-instrument), I understand that each frame consists of eight stripes. I believe these are causing the discrepancies in chl-a concentrations, as values significantly differ from one side of a stripe to the other. This variance is impacting the trustworthiness of my output. Here's an image for reference 

6
Mariana Curdoglo
Planeteer 🌎
2 months ago
A
amullen01‎‎ 🌱
asked in Monitoring

PlanetScope Ortho Tiles and CSDA license

Hello,Recently I have started using Planet Imagery through a CSDA license for the first time in about a year. Last year we were using PlanetScope Ortho Tiles through the same license. Upon recently browsing Planet Explorer I do not see an option for PlanetScope Ortho Tiles anymore. Are these still available to CSDA users? If so how can we go about accessing them? Thanks,Andrew

2
mirons
Community Manager 🌎
3 months ago
E
ElishaNjomaba‎‎ 🌱
asked in Monitoring

Cloud and Shadow Masking with UDM

Dear Community,I would like to find out how to deal with cloud masking using the UDM2 data from the PlanetScope.I already acquired an image that is cloud-free (from metadata cloud is 0.16). Do I need to do any cloud processing or masking? since this cloud percentage is basically insignificant.Again, I used a shape-file to acquire the image of my location since I want the image to span a period of data range; how do I go about the image mosaicing process?Thank you for the help 

2
E
3 months ago
T
Thomas Howard‎‎ 🌱
posted in Monitoring

Atmospheric Correction

Hi everyone, I am trying to decide whether I should perform my own atmospheric corrections to develop SuperDove surface reflectance products (especially over waterbodies).What best practices do you have for atmospheric correction over terrestrial and aquatic environments? Are there any workflows/code repositories that you have found helpful? As MODIS is decommissioned, what options exist to replace the water vapor and ozone inputs currently used in the process for generating surface reflectance products? What level of success have people had using these other inputs?  

0
T
7 months ago
S
Swapna Mahanand‎‎ 🌱
asked in Monitoring

Understanding band composition in Planet scope data.

HiI have downloaded the data for my study sites. It comprises 6 scenes.For one month i downloaded the composite image but it seems like the different scene has different stretching effect.So i downloaded the individual scenes separately to mosaic.I tried to mosaic each band of the scene using ArcGIS, mosaic to new raster tool.But i am mosaicking a single band but the output is becoming an RGB image.Can anyone help me out of this confusion. I have attached the image of mosaicking of band-4 from each scene but the output is an RGB image. This is for your kind reference.   

2
S
9 months ago
J
jawad.ziyad‎‎ 🌱
asked in Monitoring

PlanetScope Surface reflectance

Hello,I have a PlanetScope Surface reflectance Product. Is the AnalyticMS_SR.tif file is scaled surface reflectance in Digital Number ? and How do I convert the DN to surface reflectance value?

7
A
9 months ago
T
tmyeoman
posted in Monitoring

Co-registration of PlanetScope Imagery

Hello folks.  I’m wondering what approach everyone is using to co-register PlanetScope images for time-series analysis over large areas (beyond a single scene)?  My delivery was to Google Earth Engine.

9
J
10 months ago
M
Michael Ogungbuyi‎‎ 🌱
asked in Monitoring

Planetscope harmonized bands with Sentinel-2

Hi Community, I used to think the Red-edge band alongside Red, Green, Blue and Near-Infrared bands of Planet are harmonized with Sentinel-2. However, the FAQ available through New-Generation PlanetScope FAQs suggests that Red-edge is excluded. Please could someone provide some information about this?Since the harmonized band is only from, I think January of 2022. I aim to use Sentinel-2 bands (red, blue, green and NIR) as a proxy for PlanetScope bands to enable me to go back to 2018 through 2022, and then interpolate the actual PlanetScope bands from 2022 to date for a time series analysis. My second query is to ask if an existing published article exists on this.Thank you Best regards  Michael

5
elyhienrich
Community Manager 🌎
11 months ago
H
Haiyan Huang‎‎ 🌱
asked in Monitoring

the difference between _3B_AnalyticMS_SR_8b.tif and _3B_AnalyticMS_SR.tif

Hi, I am trying to use the surface reflectance product of psb.SD instruments.I found there are two versions of the SR products: 8 bands: _3B_AnalyticMS_SR_8b.tif 4 bands:_3B_AnalyticMS_SR.tif I assume the RGB and Nir  bands from the two files are the same (assume they are exactly the same in SR values). 8-band product has 4 more extra bands. best,Haiyan  

1
elyhienrich
Community Manager 🌎
1 year ago
H
Haiyan Huang‎‎ 🌱
asked in Monitoring

black lines in SR file

Hi,I found some black lines (low values ) in the NIR band of  20200224_152346_83_106b_3B_AnalyticMS_SR. Those lines do not appear in RGB bands, so I think they are not natural features.I m not sure how many files have the similar issue. Would you please check as NIR band is very important to our research. best,Haiyan

1
idilgumus
Community Manager 🌎
1 year ago
H
Haiyan Huang‎‎ 🌱
asked in Monitoring

8b SR images have black strips

Hi,I’ve downloaded some 8b sr images, but I found they have some black strips across the image. (see below, band 4 of 20230214_080952_42_2447_3B_AnalyticMS_SR_8bmore obviously in shortwave bands. would you please check?Best,Haiyan 

1
idilgumus
Community Manager 🌎
1 year ago
G
Gabrielle Ruso‎‎ 🌱
asked in Monitoring

Beginner Help: Converting to Surface Temperature

Hi all, I am a PhD student hoping to use Planet data in one of my projects.  While I have used ArcGIS in the past, I have not worked with satellite-based data before, so a lot of the terminology and data are new to me.  Given that, please forgive me for what is likely a very basic set of questions. I am interested in determining the surface temperature of various lakes over time.  Currently, it is my understanding that I should be able to download surface reflectance images and then convert these to surface temperature.  I have found a tutorial on how to do that with Landsat imagery, but I am working with small alpine lakes, and would, thus, like to work with the imagery that Planet has to offer for improved resolution and temporal replication.  At this stage, I find that I am struggling a bit with even knowing what to ‘google’ for help, so any advice or pointers in the right direction would be greatly appreciated.  How should I decide which satellites to use (e.g., Dove R, Super Dove,

4
G
1 year ago
J
Javier Muro‎‎ 🌱
asked in Monitoring

Spatial shift in udm

Hi. I’ve noticed that in some images (3/3 so far), the udm layer has some shifts across scenes for one same tile/overpass. This complicates the application of cloud masks. Is is something you are aware of? or is it rare and I was just unlucky? 5626519_3264221_2022-05-09_241c_udm25625958_3263610_2022-05-08_241c_udm25626519_3264220_2022-05-09_241c_udm2 

1
mirons
Community Manager 🌎
1 year ago
L
Leikun Yin‎‎ 🌱
asked in Monitoring

Only three bands valid for Planet Basemaps "global_monthly_yyyy_mm_mosaic"

Hi,I have a problem with the NIR band when I used the product "global_monthly_yyyy_mm_mosaic". It seems like it has four bands (RGB+NIR) band but the NIR contains only the value 255. I am not sure this is  a technical issue or this product only has three bands available.Thanks for your help!

1
Pooja Pandey
Planeteer 🌎
1 year ago
L
Léo Rasse‎‎ 🌱
asked in Monitoring

Non consistent surface reflectance values

Hello everyone,  I am using PlanetScope Scene images already corrected in surface reflectance (Dove Classic) to assess the temporal changes of the vegetation cover on a specific site. As the site is about 30 km long, I need to use several tiles to cover the whole area.  I have recently noticed that the reflectance values of the pixels of two overlapping images are quite different (even if the images were taken by the same satelitte, at the same time).Do somebody know why do I oberve this ? If yes, do somebody know how can I solve and obtain consistant surface reflectance values between overlapping tiles ? I thank you in advance for your answers, Léo

6
elyhienrich
Community Manager 🌎
1 year ago
Y
yongjun.song‎‎ 🌱
asked in Monitoring

Question with azimuth angle of PlaneScope data

Hello,I just want to know the satellite azimuth information for PS2.SD L1B images which I downloaded.I found that there are two types of metadata: GeoJSON metadata and General XML metadata.And the definitions of the "satellite_azimuth" in GeoJSON metadata and "azimuthAngle" in General XML metadata are quite different. In case of "azimuthAngle" in General XML metadata, "azimuthAngle" means "The angle from true north at the image to the scan (line) direction at image center, in clockwise positive degrees" from the PLANETSCOPE PRODUCT SPECIFICATIONS document.The "orbitDirection" of my PS2.SD L1B image is "DESCENDING" so I thought the scan (line) direction must be equal to a direction like following figure in consideration of how PS2.SD image composite were made.However, I found that "azimuthAngle" is 1.203555e+01 in General XML metadata and it doesn't make sense because I think “azimuthAngle” must be at least over 90º.So, I want to know what I missed...Thanks. (I used ‘20190408_015325_76_

3
Mariana Curdoglo
Planeteer 🌎
1 year ago
deanesh.ramsewak
deanesh.ramsewak🌲🌲🌲🌲
posted in Monitoring

Using Planet data to map coral reefs in Buccoo Reef, Tobago

Hello everyone, my team and I are utilizing Planet data for reef assessment in Buccoo Reef, Tobago. Reefs in the Caribbean region have suffered a substantial loss of 60% - 80% since 1970s and Tobago have been severely affected. We hope to use our results to implement monitoring and management strategies for the Buccoo Reef.  Here is a similar paper that I’ve found using Planet Dove Satellites for reef assessment: https://zslpublications.onlinelibrary.wiley.com/doi/full/10.1002/rse2.42 Excited to post our results soon! 

4
deanesh.ramsewak
1 year ago
Milad Niroumand-Jadidi
Milad Niroumand-Jadidi🌲 🌲
asked in Monitoring

Number of Doves and SuperDoves in Orbit?

Hi, I was wondering how can I get some info about the latest number of Doves and SuperDoves in the orbit? I know that the numbers are changing due to quite frequent launches of new satellites. I need this info separately for Doves and SuperDoves. Thanks

2
Milad Niroumand-Jadidi
1 year ago
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