High resolution data on human population distributions in Pakistan

High resolution, contemporary data on human population distributions are a prerequisite for the accurate measurement of the impacts of population growth, for monitoring changes and for planning interventions. The AsiaPop project was initiated in July 2011 with an aim of producing detailed and freely-available population distribution maps for the whole of Asia. This appears to be the highest resolution data on the subject available in open source as of today.

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Details

Units: Persons per grid square

Projection: Geographic (WGS84)

Spatial Resolution: 0.000833 degrees (~100m at the equator)

Years: 2010, 2015

Versions: (i) Adjusted to match UN national estimates and (ii) Unadjusted

Format: Geotiff (zipped using 7-zip (open access tool)

Pakistan Soil Data based on Shear wave Velocity of 30 meters

Here is the raster soil layer for the soils based on shear wave velocity of 30 meters.

Vs30 measurements (the average shear-velocity down to 30 m) are correlated against topographic slope to develop two sets of coefficients for deriving Vs30: one for active tectonic regions that possess dynamic topographic relief, and one for stable continental regions where changes in topography are more subdued.  The soil layers that are generated were based on Active Tectonic values.

Read a detailed research paper on the subject:

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For more information check out the USGS Global Vs30 Map Server: http://earthquake.usgs.gov/hazards/apps/vs30/

Airline Route Mapper

Airline Route Mapper is a Windows program for exploring route maps of over 550 airlines. You can search by airports or airlines.

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Originally available at http://arm.64hosts.com/

OrbView-3 High Resolution Images of Pakistan for Free

OrbView-3 high resolution imagery of Pakistan is now available in public domain since January 9, 2012. The images in this catalogue have been acquired between 2003 to 2007 and include more than 2400 scenes with the resolution of 1 meter (pan) and 4 meters (multispectral) of different place in Pakistan. Map below shows coverage of the available images. One can access it via USGS’s EarthExplorer as well.Orbiew-3 Coverage Pakistan

Orbiew-3 Coverage Pakistan2

Download KML file of the Coverage:

 

An analysis of mapping potential from OrbView 3 Images is given below (extracted from GIM International)

Information Content of High-resolution Satellite Image

The information content of OrbView-3 and Ikonos imagery is compared, using the Zonguldak area in Turkey as test area. Although OrbView-3 images are qualitatively slightly inferior to Ikonos panchromatic scenes, they can be used for the generation of topographic maps at scale 1:10,000. However, they are not suited for 1:5,000 mapping, for which scale Ikonos images also show limitations.

In operation since 2004, OrbView-3 is one of the recent very high-resolution space sensors, offering images of 1m panchromatic and 4m multispectral Ground Sampling Distance (GSD). In mapping terms both geometric accur-acy and information content are important, but the required geometric accuracy can be reached without difficulty provided that images are not degraded by at-mosphere and sun-elevation effects. As a rule of thumb, the GSD should be at least 0.1mm of the map scale, corresponding to scale 1:10,000 for 1m GSD.

Visual Comparison
Examination of information content has to be done by visual inspection (Figure 1). OrbView-3 and Ikonos have approximately the same resolution, but comparison shows that edges are sharper in the Ikonos image and that whilst OrbView-3 shows cars only as blobs, structural elements are visible in Ikonos. The GSD of 0.62m offered by QuickBird enables identification of more detail. On the other hand, the 5m GSD of Spot 5 limits the use of these images to the creation of maps of smaller scale. Buildings are still visible but they cannot be mapped in detail, and sometimes back-gardens will be identified as streets. Many of these differences result from sensor configuration, radiometric resolution, recording conditions and terrain characteristics.

Sensor Configuration
OrbView-3 uses staggered CCD-lines; two CCD-lines are shifted by 0.5 pixels against each other so that the pixel size projected on the ground for nadir view is 2m and adjacent pixels overlap 50% in both directions (Figure 2). The effective GSD of 1m resulting from such over-sampled pixels differs from nominal GSD of 1m. OrbView-3 takes 2,500 double lines per second, but the satellite footprint speed is 7.1km/sec, which requires permanent change of view direction to slow down angular speed. The resulting slowdown factor is 1.4 (Figure 3). The effective GSD as determined by point-spread analysis of sharp edges does not show loss of resolution against the nominal GSD, but it can be manipulated by contrast enhancement.

Radiometric Resolution
OrbView-3, Ikonos and QuickBird have a radiometric resolution of 11bit, with which 2,048 grey valu-es can be represented. However, the grey values within one scene will not cover the whole range and a qualified change from 11bit to 8bit grey values does not lead to significant loss of information. Only in some crucial areas do differences appear between the original 11bit and the derived 8bit grey values. Figure 4 shows more details in the roof in the original 11bit image than in its 8bit counterpart. This may be important for automatic image matching, but for mapping purposes it is unimportant because in both cases the building can be sufficiently well identified in all required detail.

Recording Conditions
Haze, clouds and smoke may reduce contrast; enhancement is possible but the resulting image quality will not approach that of images taken under optimal conditions. Sun elevation and azimuth cause shadows that hinder identification of details (Figure 5). With a sun elevation angle of 63°, shadows in the OrbView-3 image are not so long as in the Ikonos image with a sun elevation angle of 41°. Shadows cause identification problems in scenes with narrow streets, high buildings and terrain inclination, as is the case in the north of the Zonguldak area, but sometimes shadows may support object identification. For example, a helicopter landing-pad might at first sight look like a roof, but missing shadow may indicate that it is on the same level as surrounding grassland.

Terrain Characteristics
Contrast is the dominant component of image interpretation, but identification of objects also depends on their characteristics. Planned areas, with larger, well-arranged buildings can be more easily mapped than unplanned areas with smaller and irregu-lar objects, especially when the latter occur in hilly terrain (Figure 6). Identification of objects in planned areas does not result in significant differences between OrbView-3 and Ikonos panchromatic images, while in unplanned areas the better image quality of Ikonos resulted in a larger number of identified objects. Not every building has a rectangular shape and, particularly in hilly terrain, walls may not be parallel. Figure 7 shows a building of irregular shape (a), a rectangular building (c) and a low building throwing little shadow (b). The latter has not been identified during the mapping exercise, mainly because of missing shadow. OrbView-3 cannot take panchromatic and colour images simultaneously as do Ikonos and QuickBird, so no direct pan-sharpening was possible. Mapping with pan-sharpened Ikonos and QuickBird images simplified object identification, but this does not mean that more objects can be identified; the number was insignificant.

Results
Table 1 summarises the detection (DET) and recognition (REC) possibilities of features and objects in OrbView-3 and Ikonos imagery. Figure 8 shows maps created from panchromatic OrbView-3 and Ikonos images. All buildings and nearly all roads have been recognised in the Ikonos image; a few roads in shadowy areas have not been recognised. In the OrbView-3 mapping 93% of the buildings and 96% of the roads mapped with Ikonos are seen, while only 33% of the pavements could be identified. These results demonstrate that OrbView-3 images are well suited for creation of 1:10,000 topographic maps.

Biography of the Author(s)
Huseyin Topan is a PhD candidate for geodesy and photogrammetry in the Ýstanbul Technical University, Turkey. His main research direction is the infor-mation content and geometry of high-resolution space imagery.

Gürcan Büyüksalih is professor in Photogrammetry at Zonguldak Karaelmas University, Turkey. He received his PhD from the University of Glasgow, UK, Department of Geography and Topographic Science. His research direction is the full range of photogrammetry, especially application of space imagery.

Karsten Jacobsen received a PhD in Photogrammetry from Leibniz University, Hanover, Germany. He is academic director of the Institute of Photogrammetry and Geo-information at the same university. His main research area is numerical photogrammetry, especially the use of space imagery.

Land Capability Map of Sind

land_capability_map_sindh

Title:
Land Capability Map of Sind.

Publication year:
1978

Publisher(s):
Direction of Dt. M. Bashir Choudhri. Director General. Soil Survey of Pakistan.

Language:
En

Coordinates:
N28°10 – N23°50 °55 – E71°10

Scale:
1,000,000

Soil Map of Sindh

Soil Map of sindh

Title:
Soil Map of Sind.

Publication year:
1978

Publisher(s):
Direction of Dt. M. Bashir Choudhri. Director General. Soil Survey of Pakistan.

Language:
En

Coordinates:
N28°10 – N23°50 °55 – E71°10

Scale:
1,000,000

Soil Map of Punjab, Pakistan

Soil_map_punjab

Title:
Soil Map of the Punjab.

Publication year:
1978

Publisher(s):
Direction of Dt. M. Bashir Choudhri. Director General. Soil Survey of Pakistan.

Language:
En

Coordinates:
N34°0 – N27°50 °10 – E75°10

Scale:
1,000,000

Land Capability Map of Punjab

landcapability map of punjab

Title:
Land Capability Map of the Punjab.

Publication year:
1978

Publisher(s):
Direction of Dt. M. Bashir Choudhri. Director General. Soil Survey of Pakistan.

Language:
En

Coordinates:
N34°0 – N27°50 °10 – E75°10

Scale:
1,000,000

Raster Datasets

Following raster datasets are available for at this plate form:

  1. Digital Elevation Model Data of whole Pakistan (SRTM 90m)AB
  2. Digital Elevation Model Data of whole Pakistan (GASTER DEM 30m)
  3. Satellite Image of Pakistan Flood 13 September 2010
  4. Satellite Image of Pakistan Flood 07 September 2010
  5. Satellite Image of Pakistan Flood 02 September 2010
  6. Satellite Image of Pakistan Flood 29 August 2010
  7. Satellite Image of Pakistan Flood 22 August 2010
  8. Satellite Image of Pakistan Flood 17 August 2010
  9. Satellite Image of Pakistan Flood 15 August 2010
  10. Satellite Image of Pakistan Flood 12 August 2010
  11. Satellite Image of Pakistan Flood 11 August 2010
  12. Satellite Image of Pakistan Flood 10 August 2010
  13. Satellite Image of Pakistan Flood 08 August 2010
  14. Satellite Image of Pakistan Flood 30 July 2010
  15. Satellite Image of Pakistan Flood 28 August 2009
  16. Satellite Image of Pakistan Flood 14 August 2009
  17. Satellite Image of Pakistan Flood 11 August 2009
  18. Geo-referenced Topographic maps of Pakistan
  19. Geo-referenced Satellite Image of Sialkot
  20. Satellite Map of Abbottabad City
  21. Satellite Image of Lahore City
  22. Satellite Image of Muredkey
  23. Satellite Image of Jhelum
  24. Satellite Image of Vehari
  25. Satellite Image of Liaqatput (Rahim yar Khan)
  26. Satellite Image of Faisalabad

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