p********t
发帖数: 1219 | 1 我可以帮忙解答。同时也是看看自己的知识掌握程度如何。 |
p*****8
发帖数: 230 | 2 额。。我舍友好像在用MODIS资料反演什么东东。。。
这个不属于MODIS系统吧~~ |
p********t
发帖数: 1219 | 3 那是MODIS的应用啦。
【在 p*****8 的大作中提到】
: 额。。我舍友好像在用MODIS资料反演什么东东。。。
: 这个不属于MODIS系统吧~~
|
a*******r
发帖数: 7558 | 4 请谈谈MODIS cloud masking都有哪些方案
【在 p********t 的大作中提到】
: 我可以帮忙解答。同时也是看看自己的知识掌握程度如何。
|
p********t
发帖数: 1219 | 5 http://modis-atmos.gsfc.nasa.gov/MOD35_L2/production.html
Data Volume
The MODIS Cloud Mask Product (MOD35_L2) will be produced at the MODAPS
facility at the NASA Goddard Space Flight Center. MODAPS will produce 100%
of the MOD35_L2 product. MOD_PR35 process executes 24 hours a day (on every
MODIS L1B granule).
Approximately 288 MOD35_L2 HDF files are produced per day. Each HDF file is
roughly 47.5 MB in size, so the total data volume is approximately 13.7 GB
per day.
Production Rules
The MOD35_L
【在 a*******r 的大作中提到】
: 请谈谈MODIS cloud masking都有哪些方案
|
a*******r
发帖数: 7558 | 6 要拿自己的语言说。。。
另外我问你 为啥要做vicarious calibration?
按说在星上做校正 比如对着calib. plaque或者月亮
不就得到校准过了的radiance了吗？
every
is
【在 p********t 的大作中提到】
: http://modis-atmos.gsfc.nasa.gov/MOD35_L2/production.html
: Data Volume
: The MODIS Cloud Mask Product (MOD35_L2) will be produced at the MODAPS
: facility at the NASA Goddard Space Flight Center. MODAPS will produce 100%
: of the MOD35_L2 product. MOD_PR35 process executes 24 hours a day (on every
: MODIS L1B granule).
: Approximately 288 MOD35_L2 HDF files are produced per day. Each HDF file is
: roughly 47.5 MB in size, so the total data volume is approximately 13.7 GB
: per day.
: Production Rules
|
r****y
发帖数: 1437 | 7 star gives a much much colder temperature
you also need a "high" temperature so you can make up a curve
between cold and hot, and measured temperature supposedly in between.
vicarious target is "high" temperature object.
If you have onbard blackbody at such high temperature, that's ideal.
Amazingly many do not have it. Even having it, it could degraded in an
unpredictive way in the harsh space environment.
【在 a*******r 的大作中提到】
: 要拿自己的语言说。。。
: 另外我问你 为啥要做vicarious calibration?
: 按说在星上做校正 比如对着calib. plaque或者月亮
: 不就得到校准过了的radiance了吗？
:
: every
: is
|
a*******r
发帖数: 7558 | 8 罗教授就是渊博啊
呵呵
ideal.
【在 r****y 的大作中提到】
: star gives a much much colder temperature
: you also need a "high" temperature so you can make up a curve
: between cold and hot, and measured temperature supposedly in between.
: vicarious target is "high" temperature object.
: If you have onbard blackbody at such high temperature, that's ideal.
: Amazingly many do not have it. Even having it, it could degraded in an
: unpredictive way in the harsh space environment.
:
|
p********t
发帖数: 1219 | 9 教授您说的是thermal bands。可见光波段也有很多问题，而且更严重。
ideal.
【在 r****y 的大作中提到】
: star gives a much much colder temperature
: you also need a "high" temperature so you can make up a curve
: between cold and hot, and measured temperature supposedly in between.
: vicarious target is "high" temperature object.
: If you have onbard blackbody at such high temperature, that's ideal.
: Amazingly many do not have it. Even having it, it could degraded in an
: unpredictive way in the harsh space environment.
:
|
p********t
发帖数: 1219 | 10 我对level1以上的数据一窍不通。
为什么要vicarious calibration？因为onboard的calibrator不准呗。过了这么些年，
什么器件都有可能degrade。而且MODIS的设计对偏振效应估计不足。
【在 a*******r 的大作中提到】
: 要拿自己的语言说。。。
: 另外我问你 为啥要做vicarious calibration?
: 按说在星上做校正 比如对着calib. plaque或者月亮
: 不就得到校准过了的radiance了吗？
:
: every
: is
|
r****y
发帖数: 1437 | 11 哈哈，我有一个阴谋论假设
为什么这么多年calibration都是小打小闹的incremental发展，大家是不是私下
都想千万别很空出世一个独步天下one fit all的calibration方法，不然就没饭吃了。
看看那帮炼钢的，当年多火，结果是钢越炼越牛，系都没了，遑论专业。再看
calibration,
那真是一辈子的饭啊。
对可见光懂得不多，不过好歹你们有个太阳啊。红外就太诡秘了，不过
Wisconsin
group这两年搞得那套calibration很novel，敬仰。
【在 p********t 的大作中提到】
: 我对level1以上的数据一窍不通。
: 为什么要vicarious calibration？因为onboard的calibrator不准呗。过了这么些年，
: 什么器件都有可能degrade。而且MODIS的设计对偏振效应估计不足。
|
