Hello! Thanks for these videos, they are incredibly helpful. Is there any way you could re-upload without the background music? Makes it a little bit difficult to follow along with what you’re saying
It would be great if you could split the videos into Arcmap, QGis, and R as not everybody has this three software, especially the Arcmap. Most ppl needs this kind of video when they really need it, like me, i need to do it in R but have to watch all the videos.
Hi minghan wang. Thanks for your comment. I am trying to do original content, you have a lot of video tutorials about R or ArcMap, but mi course is the only one that compares them. With respect to QGIS, I recommend you to follow the course related to geoestatistics using R integrated in QGIS. Follow the link: ua-cam.com/video/3EQ0G_SSm9A/v-deo.html
@@GeoRGBCommunity Hi Geo. Your video of interpolation is the best on youtube as far as I know. That's why I think for this part, I would prefer a split version.
Hi Flor, Thank you very much for your positive comment, I really appreciate it. The problem is located in your spreadsheet. My recommendation is to change in the spreadsheet the name of the variable of interest for gw, then load again the spreadsheet in RStudio and see if it works. Let me know if you can fix it. Have a great day.
Sir, I don't know why I am not getting accurate results while I run the code 'quantile(dist(Adf[,1:2])) # distances between points' My min and Max distance between points are 4.5m to 145 km. But, while I run the code it just shows the range between 1-1023.006. My number of samples are 1024. Also, my variance values are coming very less. So the variogram is also not coming properly. Don't know why but the distance is showing 1m. I am stuck with all these steps and can't proceed further. It'd be great if you could help, Sir.
Hi Prava. It is hard to know what happen without having the data. My first approach is related to the coordinates. Are you using UTM coordinates? are you data well display in a UTM grid? did you have the UTM coordinates at the columns 1 and 2 (first X and second y)?
@@GeoRGBCommunity Yes Sir, there was a problem with my coordinates which I fixed recently. My coordinates were in degree decimal. Now, I converted it into meters. It seems this fixed the issue. Thanks a lot.
Hi Dragon Xia. Thank you for your comment. You can find the code of each video at the comment section, if you cannot see it try the option "sort by" and choose a different option. If you have troubles loading Google Earth satellite images using QGIS check the video "Download and georeference Google Earth images in QGIS 3.1 with Quickmap Service Plugin" on my channel. Have a great day.
Error in ggplot(Adf, aes(gw)) : could not find function "ggplot" and Error in lillie.test(Adf$GW) : could not find function "lillie.test" Again showing like this. please help me
@@GeoRGBCommunity Thank you sir for you valuable feedback. Sir, I want to do Trend Surface Analysis of Land surface Temperature of Kolkata Metropolitan Area, West Bengal, India. I extract LST from Landsat 8 OLI and randomly select 5000 pixel from whole area. I also extract their respective Latitude and longitude of pixel in arcGIS. I want polynomial regression upto 6 degree order. X (Longitude), Y (Latitude) and z(Temperature/LST). I can't complete polynomial regression.
Hi Asad, I am not sure what problems are you facing but I am going to try to give you some ideas. 1) Work with UTM coordinates (meters or kilometers) instead of Lat and Long. The point is if you need to remove the trend from your data to estimate the values with kriging you need the units of distance in m or Km. 2) Go step by step. First create the scatter plot, Temperature (T) Vs X coordinates and T Vs Y coord. Then, try to fit the first order polynomial, then the second, third and so on. In that way you we will see where you have the problem. 3) I am not sure if you can do this type of analysis with ArcGIS, I am not familiar with the software. Fortunately, R is a free software and you can execute this type of analysis. 4) I have never analyzed 6 order polynomials. You have to be very carefully because you can over fit your data to the polynomial and get grow results. Temperature can have a gradient, depending on the elevation of the terrain and other factors, but an order of 6 is too much. As a maximum, I fitted a 3-order polynomial and 3 order surface. 5) Recently, I finished a geostatistical course about R and QGIS where I explained all these topics really well. I leave you the link bellow: giscourse.online/courses/second-geostatistics-course-bivariate-analysis-with-r-and-qgis/ 6) You can also watch the summary of each lesson of the course in the GeoRGB youtube channel, just to make sure that the course is going to help you. Cheers
################################################################################
################## INSTALL PACKAGES & LOAD LIBRARIES #######################
################################################################################
# gstat: Spatial and Spatio-Temporal Geostatistical Modeling, Prediction and Simulation
library(gstat)
# sp: Classes and Methods for Spatial Data
library(sp)
# ggplot2: Create Elegant Data Visualizations Using the Grammar of Graphics
library(ggplot2)
# rgeos: Interface to Geometry Engine - Open Source ('GEOS')
library(rgeos)
# readxl: Read Excel Files
library(readxl)
################################################################################
##################### LOAD DATA, VIEW DATA & STATISTICS ########################
################################################################################
A
I really like the video and detailed description! Thank you!
Thanks Hasret Sahin for your positive comment. You can also visit the GeoRGB community website, where you can find a lot of content. giscourse.online/
This is an enjoyable and enlightening series thank you very much
Hi Dillan. Thank you for your feedback.
Great series sir. thank you very much.
thanks for the comment :)
Very good Job Sir, thank you so much
Thanks :)
Very good videos. Thank you so much!
Thanks for your comment
Really sir awesome explanation 👌
Thanks for the comment. It is nice to get some feedback!
Hello! Thanks for these videos, they are incredibly helpful. Is there any way you could re-upload without the background music? Makes it a little bit difficult to follow along with what you’re saying
Thanks for the comment. Unfortunately I cannot take out the music.
I have a question, after importing the .csv file
when i am running view(A) it is showing could not find function "view"
Hi OmPrakash Biswal, it has to be the "v" as a capital letter. View(A). Have a good day.
@@GeoRGBCommunity Thanks man this was a really helpful video
It would be great if you could split the videos into Arcmap, QGis, and R as not everybody has this three software, especially the Arcmap. Most ppl needs this kind of video when they really need it, like me, i need to do it in R but have to watch all the videos.
Hi minghan wang. Thanks for your comment. I am trying to do original content, you have a lot of video tutorials about R or ArcMap, but mi course is the only one that compares them. With respect to QGIS, I recommend you to follow the course related to geoestatistics using R integrated in QGIS. Follow the link: ua-cam.com/video/3EQ0G_SSm9A/v-deo.html
@@GeoRGBCommunity Hi Geo. Your video of interpolation is the best on youtube as far as I know. That's why I think for this part, I would prefer a split version.
Hello, excellent video!
I have a question, at the time of making the histogram it indicates element "gw" not found. Do you know why?
Hi Flor, Thank you very much for your positive comment, I really appreciate it. The problem is located in your spreadsheet. My recommendation is to change in the spreadsheet the name of the variable of interest for gw, then load again the spreadsheet in RStudio and see if it works. Let me know if you can fix it. Have a great day.
Sir, I don't know why I am not getting accurate results while I run the code 'quantile(dist(Adf[,1:2])) # distances between points' My min and Max distance between points are 4.5m to 145 km. But, while I run the code it just shows the range between 1-1023.006. My number of samples are 1024.
Also, my variance values are coming very less. So the variogram is also not coming properly. Don't know why but the distance is showing 1m. I am stuck with all these steps and can't proceed further. It'd be great if you could help, Sir.
Hi Prava. It is hard to know what happen without having the data. My first approach is related to the coordinates. Are you using UTM coordinates? are you data well display in a UTM grid? did you have the UTM coordinates at the columns 1 and 2 (first X and second y)?
@@GeoRGBCommunity Yes Sir, there was a problem with my coordinates which I fixed recently. My coordinates were in degree decimal. Now, I converted it into meters. It seems this fixed the issue.
Thanks a lot.
good explain! bu the way, where can we find your code?
Hi Dragon Xia. Thank you for your comment. You can find the code of each video at the comment section, if you cannot see it try the option "sort by" and choose a different option. If you have troubles loading Google Earth satellite images using QGIS check the video "Download and georeference Google Earth images in QGIS 3.1 with Quickmap Service Plugin" on my channel. Have a great day.
Error in ggplot(Adf, aes(gw)) : could not find function "ggplot"
and
Error in lillie.test(Adf$GW) : could not find function "lillie.test"
Again showing like this.
please help me
Sir I want to do trend surface analysis of land surface temperature in arcGIS and R. But I can not complet it pleas help me
Hi Asad, let me know where you are stuck.
@@GeoRGBCommunity I can not complet polynomial regression with latitude, longitude and dependent variable like temperature.
@@asadalisarkar4253 I am sorry, I cannot help you with the information you provided me. can you tell me something more?
@@GeoRGBCommunity Thank you sir for you valuable feedback. Sir, I want to do Trend Surface Analysis of Land surface Temperature of Kolkata Metropolitan Area, West Bengal, India. I extract LST from Landsat 8 OLI and randomly select 5000 pixel from whole area. I also extract their respective Latitude and longitude of pixel in arcGIS. I want polynomial regression upto 6 degree order. X (Longitude), Y (Latitude) and z(Temperature/LST). I can't complete polynomial regression.
Hi Asad,
I am not sure what problems are you facing but I am going to try to give you some ideas.
1) Work with UTM coordinates (meters or kilometers) instead of Lat and Long. The point is if you need to remove the trend from your data to estimate the values with kriging you need the units of distance in m or Km.
2) Go step by step. First create the scatter plot, Temperature (T) Vs X coordinates and T Vs Y coord. Then, try to fit the first order polynomial, then the second, third and so on. In that way you we will see where you have the problem.
3) I am not sure if you can do this type of analysis with ArcGIS, I am not familiar with the software. Fortunately, R is a free software and you can execute this type of analysis.
4) I have never analyzed 6 order polynomials. You have to be very carefully because you can over fit your data to the polynomial and get grow results. Temperature can have a gradient, depending on the elevation of the terrain and other factors, but an order of 6 is too much. As a maximum, I fitted a 3-order polynomial and 3 order surface.
5) Recently, I finished a geostatistical course about R and QGIS where I explained all these topics really well. I leave you the link bellow: giscourse.online/courses/second-geostatistics-course-bivariate-analysis-with-r-and-qgis/
6) You can also watch the summary of each lesson of the course in the GeoRGB youtube channel, just to make sure that the course is going to help you.
Cheers