سلام:

يمكنك الاطلاع على موضوع الزميل وهيب سهوان لتغطية مرئيات لاندسات للوطن العربي:


http://www.gisclub.net/vb/showthread.php?t=1799


اما فيما يخص دراسة التبخر باستخدام لاندسات، فهناك الكثير من الدراسات في هذا المجال و يمكنك الاطلاع على الدراستين التاليتين:


http://www.springerlink.com/content/g7pl532p71l784vh/

http://www.isprs.org/proceedings/XXX...papers/380.pdf


اما اسعار و انواع المرئيات المتاحة، فهي من الجداول التالية:

Scene Size Optical Data Processing Options

Path Image Map Oriented* Image Orthocorrected* Image
Small Scene
Up to 625 sq km
e.g. 25 x 25 km - $450 $550
Ninth Scene
Up to 3600 sq km
e.g. 60 x 60 km - $600 $700
Quarter Scene
Up to 8100 sq km
e.g. 90 x 90 km - $700 $800
Half Scene
Up to 16,900 sq km
130 x 130 km - $800 $900
Full Scene
185 x 185 km approx $1100 - -
Full Scene
Up to 41,625 sq km
e.g. 225 E-W x 185 km N-S - $1100 $1200
Double Scene
185 km across track and 355 km along track $1300 - -
Double Scene
Up to 95,850 sq km
Max 270 E-W x 355 km N-S - $1300 $1450
Triple Scene
185 km across track and 530 km along track $1500 - -
Triple Scene
Up to 164,300 sq km
Max 310 E-W x 530 km N-S - $1500 $1700
* All Map Oriented Image and Orthocorrected Image products are variable windows and may contain blank pixels, depending on the scene's dcidcilocation within the satellite path. Please refer to the separate web page for a more detailed description of Landsat Variable Window.


====
Scene Size Optical Data Processing Options

Path Image Map Oriented* Image Orthocorrected* Image
Small Scene
Up to 625 sq km
e.g. 25 x 25 km - $400 $500
Ninth Scene
Up to 3600 sq km
e.g. 60 x 60 km - $450 $550
Quarter Scene
Up to 8100 sq km
e.g. 90 x 90 km - $550 $650
Half Scene
Up to 16,900 sq km
130 x 130 km - $650 $750
Full Scene
185 x 185 km approx $750 - -
Full Scene
Up to 41,625 sq km
e.g. 225 E-W x 185 km N-S - $750 $850
Double Scene
185 km across track and 355 km along track $950 - -
Double Scene
Up to 95,850 sq km
Max 270 E-W x 355 km N-S - $950 $1100
Triple Scene
185 km across track and 530 km along track $1150 - -
Triple Scene
Up to 164,300 sq km
Max 310 E-W x 530 km N-S - $1150 $1350
* All Map Oriented Image and Orthocorrected Image products are variable windows and may contain blank pixels, depending on the scene's dcidcilocation within the satellite path. Please refer to the separate web page for a more detailed description of Landsat Variable Window.

===

Scene Size Select from between 2 to 6 scenes so long as:
. 1 to 5 SLC-Off scenes are chosen, and
. 0 to 1 SLC-On scenes are chosen
2 scenes (minimum) Each additional scene#
Small Scene
Up to 625 sq km
e.g. 25 x 25 km $550 $25
Ninth Scene
Up to 3600 sq km
e.g. 60 x 60 km $600 $25
Quarter Scene
Up to 8100 sq km
e.g. 90 x 90 km $700 $25
Half Scene
Up to 16,900 sq km
130 x 130km $800 $25
Full Scene
Up to 41,625 sq km
e.g. 225 E-W x 185 km N-S $900 $25
Double Scene
Up to 95,850 sq km
Max E-W x 355km N-S $1150 $50
Triple Scene
Up to 164,300 sq km
Max 310 E-W x 530 km N-S $1400 $75
# For example, a full scene produced from 3 SLC-Off scenes and 1 SCL-On scene would cost $900, +$25, +$25, i.e. $950.

ملخص الجداول اعلاه ان المشهد الواحد 185 ْ* 185 كم بثمان حزم (خام غير مصحح) يكلف 1100 دولار وتزداد الكلفة حسب درجة المعالجة.

يمكنك شراء هذه المرئيات اونلاين او من خلال احدى شركات الاستشعار عن بعد في بلدك.


مع الود ..