Satellites In Space Mapped Beautifully

Have you imagined how satellites have surrounded earth surface
Click ESRI satellite Map which beautifully visualizes all satellites surrounding earth.

Image Source: ESRI Satellite Map

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GDAL & OGR (Importance & Installation)

GDAL & OGR libraries allow you to perform various GIS operations like, Flow Direction or working with DEM few raster & vector analysis outside GIS environment. Image by Gerd Altmann from Pixabay What Knowledge one should have : Basic Programming, Python What software you need : Python IDLE or command line, GDAL libraries files (explained later) Installation : 1- Once you have Python installed. 2- Start python IDLE to check which version of python you are using available at top as shown Python IDLE 3- Install two files available at link below based on your version of python. Download Link : http://www.gisinternals.com/query.html?content=filelist&file=release-1500-gdal-2-1-2-mapserver-7-0-2.zip Install first : gdal-201-1500-core.msi and then: GDAL-2.1.2.win32-py2.7.msi * Note specify the path C:\Python27\ArcGIS10.3\Lib\site-packages\ for GDAL-2.1.2.win32-py3.2.msi as shown in figure for (ArcGIS lib installed in python) Pyth

“Rule Based Classification” using eCognition

Availability of high resolution satellite imagery leads to a growing number of change detection techniques and algorithms, research is done using remote sensing and GIS. In this tutorial, we build on the classification category feature set by introducing neighborhood relationships and topological functions. Secondly, we use relative elevation values and fuzzy rules for the classification systems. This study demonstrates that the rule-based classifier is a significantly better approach than the classical per-pixel classifiers & object based NN method . Image Source: NASA Methodology 1. Open the eCognition software. 2. Click on “create new project” option. 3. Import the “Study area image” from the workspace. 4. Assign weights to NIR band 5. Click on the layers and rename each layer. Layer 1 as blue, layer 2 as green, and 3rd as red and 4th NIR. 6. Go to “Process” option on the top toolbar and open “ process tree” All the operations in ec

Working With Raster Calculator In ArcMap

Raster Calculator extracts information from a Raster Image, based on user requirements. Image by James Osborne from Pixabay Working with Raster Calculator To explore the highest elevation areas in your DEM raster e.g. select Spatial Analyst Tools à Map Algebra Raster Calculator Tool Raster Calculator Double click on the layer e.g. in my case it is DEM_Layer or any raster of your choice, to enter this into the ‘ search ’ window. Click on the “ > ” symbol e.g. and select a number less than the maximum elevation . Query can change based on your criterion. This arithmetic raster operation will select all cells with values above the defined threshold. In the example below a threshold of 500m was used. A new layer appears on your map. The majority of the map has a 0 value representing false (values below the threshold), and the colored region has a value of 1 representing true ( eleva

Learning Object Based Classification Using eCognition

Object Based Classification Using eCognition tutorials by GIS HIVE . ImageSource:PixaBay Lab 01 Performing Image Classification On High Resolution Data on Erdas Imagine Lab 02 Introduction to eCognition Basics Lab 03 Image Segmentation using eCognition Lab 04 Object Based Classification Using Standard NN eCognition Lab 05 Rule Based Classification using eCognition GIS HIVE intends to promote Geo Spatial Sciences awareness, for that purpose GIS HIVE has launched Youtube Channel . Here you can explore various Geospatial tutorials.

What is Radiometric Resolution Of Satellite Image

Radiometric Resolution is defined as magnitude of EM ( Electromagnetic Energy ) recorded by a sensor Units : Measured in Bits Formula: Each bit records an exponent Power of 2. 1 Bit= 2 2 Bit=4 4 Bit =16 8 Bit=255 digital values Note: 0 represents Black tone and maximum like 255 represents highest tone. image source www.satimagingcorp.com 1 Bit will be Black & white 16 Bit will be colored 32 Bit will be more colored and will carry greater energy levels Higher Radiometric Resolution much variation in colors reflected. Image to left is of higher radiometric resolution than that of Landsat below. image source: geoinfo.amu.edu.pl

Generating Contours From DEM In ArcMap

Contours are a useful way to visualize topography and to create a map that can be printed in black and white, or that mimics the standard USGS topo maps. Image by TheAndrasBarta from Pixabay What you need: DEM data of your Area. Extract your area from online freely available DEM and select Spatial Analyst Tools -> Surface -> Contour. Select the inputs as follows, with a 100m or 50m contour interval: since 10 m might take time. and click OK. Contour tool in ArcMap Output may be some thing like depending on color scheme. Go to properties and label elevation values for a good visualization. Image source: en.wikipedia.org

GeoDa Free GIS Software

What is GeoDa : GeoDa provides analysis of various data formats like shapefile, GeoJSON, KML, SQLite and table format (CSV, XLS and DBF). Image by Pexels from Pixabay How it is related to GIS: It provides Geo-visualization, user can perform certain spatial analysis. Good things about GeoDa: GeoDa is an Open Source software, Along with Spatial analysis, simpler & complex statistical data analysis performed in excel (charting, graphing ) can be performed in GeoDa. Most suited for: It is most suitable for Students, Researchers. Downloadable link : http://geoda.software.informer.com/1.8/ imagesource: GitHub

Climate Change Not Myth But Reality

Northern Areas of Pakistan are blessed with beauty, we often hear people quoting these beautiful areas as “Switzerland of Pakistan”, “Heaven on Earth”, but these words proved there reality when for the first time I visited Northern Pakistan. It is worth mentioning that Pakistan is dependent on frozen hydrological resources. Many rivers such as River Swat, Chitral, Gilgit, Hunza, Shigar, Shyok, Indus, Shingo, Astor, and Jhelum are fed by runoff generated by melting of SC of Northern areas. Image by Aqsa kamran from Pixabay Image by Abdullah Shakoor2 from Pixabay This runoff supports agriculture . Agriculture of Pakistan is largely dependent on the snow melting phenomenon. Anomalies witnessed in glaciers and their melting patterns will have massive impact on hydrological resources because the country’s 70% of fresh water depends upon these frozen hydrological resources in the high mountains of Himalaya and Hindu Ku

How Pakistan Can Benefit From GIS

Geo Spatial Sciences are being applied all over the globe, for efficient and good governance. Developed and under developed countries are focusing to include innovation in geographic sciences for better administration and management. Image by Uzairmaqbool from Pixabay Issue of Tax- Evaders in Pakistan : Ministry of Finance, FBR (Federal Board of Revenue) often complain about tax evaders, a good approach for them is use GIS, using satellite images every individual lot can be mapped, property tax system can be made updated using spatial approach. Transportation Planning can be enhanced with Remote Sensing : Using Remote Sensing techniques, government can map the parking lots with vehicle density, which can be used to identify urban area transportation problem. Urban Planners can benefit from LU/LC maps: Using Land Use Land cover maps; change detection can be monitored and analyzed on regular basis, on basis of accurate data set. Forest Monitoring made easy:

How To View Satellite Image In ArcMap

Viewing Satellite Map in Arc Map " Are you interested to study satellite image, go to google and search for freely available online satellite images" Image by Daryl Govan from Pixabay Download them, i have added tmrect.bil named imagery here Bands Added In ArcMap Right Click tmrect.bil in ArcCatalog Select preview section and examine tmrect.bil What is tmrect: It is Landsat TM image with 5 bands . Right Click on tmrect and select properties All information of satellite image is available in Raster section. Explore tmrect.bil by expanding it you will see 5 bands in drop down Now Launch Arc Map Insert a new Data Frame by clicking on insert as shown Spatial Reference Dialogue Now to Add Data Right Click Task Data Frame and click Add Data Select tmrect.bil a window “Unknown Spatial Reference” is displayed. Click OK Arc map will display Raster Image as

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