Hướng dẫn sử dụng phần mềm SeaDas

tuan rimf

11/08/2016

Phần 1: Title: "Khái niệm cơ bản (Bắt đầu)"

Bắt đầu làm quen phần mềm SeaDAS

0:00

hey this is Danny this is a case study using cedars of broken up into many

0:05

parts each part represents a poor concept and see does if you want to see

0:10

all the parts there is a longer version of this video on our site

0:19

let's get the data here's the nasa Ocean Colour website

0:24

weaker today

0:26

will use level 3 so that level 3 browser

0:31

and went to find the motifs mission

0:34

and then we want to find the sea surface temperature for nighttime will use of

0:39

lebanon micrometer

0:41

the monthly by default at nine kilometer resolution will be fine

0:46

you go down in 10 find December 2009 we're actually looking for January but

0:54

we need the preceding month so December January February here's our el nino

1:00

event we can download the data here want to bend file

1:06

save it is also has some my files and for the london you get these three files

1:13

right here

1:15

additionally we want the monthly climatology choose the long-term monthly

1:20

averages and we'll get December January and February files here is periods that

1:27

those cover

1:34

here's all the file

1:35

of group them in the three directories December January February and each these

1:42

are monthlies I want to create a three month file that spend files each

1:49

directory of made a text file

1:52

that's good to see it as

1:54

Andrew data processing go double three been opens in 10 find our text file

2:03

which this all the files in our directory but default it will start at

2:08

your top but it remembers where I was last

2:12

select it

2:14

let's rename this

2:16

copy from the clipboard and they might already have made and the output

2:22

parameter is the data products we want it only has one so just leave it the

2:28

default on the lawns is the whole things will keep that change system that city

2:36

run it

2:40

and why

2:41

like to point out that you can run this exact same command at the command line

2:47

here's what that command would be for the Sun area

2:52

que finished take a look at it

2:55

here's the file on noted have made a log file can look at that and this all the

3:02

files that went into it for future reference

3:06

and we did the same with the other two directories

3:12

for more information please visit the CTS web site

Phần 2

Mặt nạ

0:00

this is Danny let's take a look at how

0:03

to work with masks and seed ass

0:06

I have a level to file opened with

0:09

chlorophyll and an SST in it and we see

0:12

a correlation in the temperature here

0:14

because of the Gulf straight and so

0:16

we're going to work with masks to try to

0:19

look at that gulf stream data so let's

0:23

go to the mask manager

0:25

expand the window

0:28

so we can see it all

0:31

we'll see the land mask these masks

0:34

already come with the level to file so

0:37

we can view the mask by toggling it on

0:40

and off thats the land we can adjust the

0:44

color let's set it the black i'd like to

0:48

point out over here within the pixel

0:51

info all our flag values are available

0:55

so for every pixel we have flags and

0:58

these flags or what ultimately create

1:01

masks over here so we can make a

1:05

composite mask over here of many masks

1:09

so let's determine which flags we want

1:11

to use and make a composite of all these

1:13

flags so to highlight these we click in

1:16

the middle so and hold the option key so

1:18

let's let's get land and let's get

1:22

Coastal's Z will get cloud ice turbid

1:27

water and we'll get the ATM warned

1:33

let's go over here these are shortcuts

1:35

here create a union of the selected

1:38

Basques so let's click that and we have

1:41

a new mask and if we toggle this on and

1:44

off we see the colors here for the mask

1:48

and what we've just created is what

1:51

we're gonna do not valid ocean will call

1:57

this not valid ocean now we can make a

2:01

valid ocean mask which would be the

2:03

opposite of this we can select it and we

2:07

can go find the compliment right there

2:11

create the compliment turn that off and

2:14

now we see this is the valid ocean

2:18

call it valid ocean

2:23

if we want to only see the valid ocean

2:26

then we turn that off

2:28

obviously we can turn this mask on and

2:31

then we can adjust the color let's set

2:34

this to gray its normal value for no

2:36

data and let's go ahead and set the

2:39

transparency this column is transparency

2:42

can't really see it they're both expand

2:45

that you could set that to zero and so

2:48

now we can turn off the land if you want

2:51

we're only seeing the valid ocean data

2:53

turn the land back on so let's go

2:58

further into this and separate out based

3:01

on the band values so let's create a

3:04

Mask using this expression editor here

3:08

here we can see all the flags

3:12

let's turn those off and let's look at

3:13

the band and let's go look at SST click

3:19

here gives us the SST band

3:22

and we're going to say well that's

3:24

greater than or equal to 25 degrees

3:27

Celsius we click ok and we now

3:35

leave that let's see what we've done

3:38

we've just made a mask word where the

3:43

value is greater than 25 degrees Celsius

3:46

now this could be include any pixel we

3:50

really want is valid ocean so let's go

3:52

ahead and edit this field to edit it

3:56

click on it and go to this and so here

4:00

to edit it and type and and now I want

4:06

to get my mask turn off the flags leave

4:10

the masks on which I just did go down

4:13

here and get my valid ocean so now we'll

4:17

get the Gulf Stream

4:21

and let's name it

4:27

gulfstream we could also an incision now

4:31

if we toggle that on an offer for seeing

4:33

the Gulfstream you can also if we want

4:36

to view just the Gulfstream we want to

4:39

make the compliment of this so let's go

4:41

ahead and create the compliment and

4:44

we'll call that

4:47

not Gulfstream

4:51

like we did before let's set this to

4:54

gray and the transparency 20

4:59

don't need that so now we're doing just

5:02

the gulf stream water so at this point

5:06

the Gulfstream this for visualization

5:09

this is our setup but if we want to use

5:12

statistics or some other toll this is

5:16

our region of interest mask right here

5:18

toggle in it on and off we see this is

5:20

our Gulf Stream data so if we go up to

5:23

statistics here look here we can use

5:27

region-of-interest mask let's go down

5:30

and got to spend the window

5:34

I want to select the Gulf Stream and go

5:38

and we've got statistics on that

5:41

more on that in later videos so now

5:44

we've made a mask and we can

5:46

additionally export this mask so let's

5:49

export it want to highlight the mass

5:51

which we want to export holding down the

5:54

option key let's get these for masks and

5:58

we'll explore them

6:00

we have a name it defaults to the first

6:05

one but this is a my golf masks

6:12

save it

6:14

ok now if we go to file manager we can

6:18

grab another file

6:21

and i will get a file that was seven

6:27

days later

6:30

and open that chlorophyll go to mask

6:34

manager and if we click on the right one

6:37

import

6:40

import that masks

6:43

and that pulls the men and now and turn

6:48

that on and probably 12 zoom out so you

6:50

can see this

6:52

so once again up here we had our land

6:55

and by default it's that can make it

6:58

black but the nice thing is all our mass

7:02

we made in the previous file are

7:04

available in this new file also

7:07

important to note the masks we just

7:09

imported have equations which are

7:12

dependent on other masks so if these

7:15

masks are not in the new file then these

7:18

new masks won't work that's about it for

7:21

masks you'll need them for statistics

7:23

and an image display and you can use

7:26

them in the band mouth stole up here to

7:28

create and based on mask also if you're

7:32

interested in a particular geometric

7:34

area you can use the geometry tools here

7:37

to create masks of those areas

7:42

one last point is the description field

7:45

right here contains the equation but if

7:48

you edit this field you're not editing

7:51

the equation you're just editing the

7:53

description so don't make that mistake

7:56

to edit the equation you need to go to

7:59

this editor tool here

8:03

for more information please visit the

8:05

CBS website

Phần 3: nghiên cứu nhiệt độ biển không bình thường

phần 4: Độ sâu

0:01

this is Danny today we're gonna take a look at the them a tree and elevation

0:05

tall

0:05

NCDs it's useful because it lets you analyze and visualize your data at

0:10

specific water depths

0:11

let's take a look so here we have a level 3 chlorophyll file

0:16

opened up in seed ass

0:19

so what's open the but the matricula

0:23

pull it in the view right here we have the mask name which will be created

0:28

you can't edit this field we have the color

0:31

the mask transparency but said it

0:34

points 3 aces so that a more visible when I show it to you

0:38

we have the depth Rangers right here minimum and maximum

0:42

the the salon for the moment and unable banal bands which will

0:46

said it as visible in all bands if you have it checked

0:50

we have the best amateur baton that the topography bad and elevation ban and

0:55

here's the names they cannot

0:57

be edited as well so will create the

1:00

bans and masks and we see the bands right here

1:06

and over here as we've seen the mask

1:08

is there the Canon the mask manager here's the mask

1:13

its blue you can toggle it on and off we could see the mask

1:17

this is just a standard mask like any other mass concede ass

1:22

weekend edit it

1:25

and let's go ahead and set this to the Continental

1:29

shelf elevations we see here

1:33

our masks is along the continental shelf

1:36

we go ahead and take a look at the topography battened

1:40

Damascus on we see the elevation

1:44

values are positive here looking in the window

1:48

there we can see elevation their positive and they're not all

1:52

for the CE for two Pa graffiti for the ocean

1:55

and the cemetry we've got the ocean

1:59

elevations are negative and all

2:02

overland and that's essentially it at this point we now have a pet cemetery

2:07

mask

2:07

and its associated batons we can use the statistics toll here

2:12

for statistics with the mask we could use the bad math call if we want to make

2:18

a bad which contains only chlorophyll pixels

2:21

at the specified water depth Rangers

2:24

we could use the Kontor toll here if we want to create

2:28

and ice about line along the US continental shelf in this example

2:32

use in the lair manager we could choose the stacked the bands such that the

2:37

topography orbit cemetry data is displayed simultaneously with the

2:41

chlorophyll

2:42

so this concludes this tutorial for further help please visit the CTS web

2:47

site

Phần 5:

0:04

hey this is danny i'm in seed ass right

0:07

here and I'm going to show you how to

0:09

view color schemes and color bars for

0:12

multiple images which are open

0:14

simultaneously so here we have a level

0:19

to file from modis aqua here all the

0:22

raster data and it with the products and

0:27

over here we have the KT 490 its color

0:31

scheme and the color bar associated with

0:33

it we have chlorophyll again its color

0:36

scheme and color bar we have the surface

0:40

reflectance of the green band at 555

0:44

nanometers its color bar and we have sea

0:48

surface temperature and we're reviewing

0:51

all the bands at once so i'm going to

0:53

show you how to do this

0:57

ok so we've got our level to aqua file

1:00

here let's start with the KT 490 open it

1:03

let's get default color scheme want to

1:06

put a color bar to it go here

1:11

and what I want to do the first time

1:13

through i want five points preview see

1:17

the five points not when i click OK

1:19

points are on here and I can go to

1:22

manually and distributed points and I

1:25

can clean this up a little bit

1:29

let's make that point to that a 1.0 and

1:35

let's make that 6.0 review it again

1:39

looks a lot cleaner and let's go ahead

1:42

and create the lair

1:45

click over here to view it all down here

1:49

already have the name up here so maybe

1:51

we don't need this here click on the

1:54

color bar and let's turn off the title

1:58

great layer that fix that so now i have

2:02

my Katie 490 let's go ahead and open the

2:08

chlorophyll

2:11

this again this is given the default

2:14

color scheme over here let's go ahead

2:17

and add a color bar to that going to

2:20

turn off the title

2:23

and that's preview it ok we want to

2:26

clean that up a little bit

2:28

someone got a manual distributed points

2:31

and let's go ahead and give that

2:35

pointone their point five make that a

2:41

2.0 and I 20.0 that should be fine

2:46

preview okay

2:49

create the layer view all there it is

2:54

there

2:55

let's go ahead and window tile

2:58

horizontally and that's synchronize the

3:03

images and click all so move over so we

3:08

see our color bar for two of our images

3:11

and we can keep doing this we can go

3:15

ahead and get the SST

3:17

add a color bar to that turn off the

3:20

title as we did before

3:23

preview it we will want to clean that up

3:27

click manually distributed points and we

3:31

can go ahead with a zero on that

3:37

for 10 20 30 and 40 should be sufficient

3:48

preview okay great the lair

3:54

window tile horizontally again click all

4:01

and let's go ahead and do the surface

4:04

reflectance for the green ban for this

4:07

one

4:09

i'm going to set this at zero and one

4:15

for the minute max and put in log scale

4:19

sorry not 0.01 log scale

4:26

let's go ahead and put the color bar on

4:29

that get rid of the title preview that

4:34

looks reasonable and create the layer

4:37

and now we'll do window tile

4:40

horizontally

4:43

click OK for doing them all now what we

4:46

can do is we can hide this to get more

4:50

real estate guide that I this this and

4:57

this and will we click on sorry we go

5:04

appear tile horizontally now that it

5:08

seems we have all that real estate and

5:10

we can click all to get these things

5:14

bigger more doable and that's pretty

5:18

much what i showed you to begin with

5:20

you might want to make these bigger if

5:23

you decide to make the font bigger you

5:27

can go down here on the table size might

5:31

wanna wrap it up and maybe instead of

5:34

having at ninety percent of the with you

5:36

could make it a hundred and would just

5:38

increase that and we could do that to

5:40

each of these is 260

5:45

and a hundred and what do it to each

5:50

just show you this display like had

5:55

shown originally

5:59

60 and 100

6:04

and there we have it and we can add the

6:08

land mask if you want in which I had

6:10

showed earlier so click on land and its

6:14

color it black and do the same

6:19

here and the same

6:25

there

6:29

should close down that got opened

6:33

somehow

6:34

ok so now we're viewing all our bands

6:37

we've got color bars and it's a really

6:40

nice way to display your bands and of

6:42

course you can

6:43

in here you can be with the pixel level

6:45

zoom-in move around

6:51

for more information please visit the

6:54

CBS website

[Latest News][7]

Viễn thám biển

Ad Section

Main Menu

Hướng dẫn sử dụng phần mềm SeaDas

Ads Top

Comments

Recent

Bottom Ad [Post Page]

Blog Archive

Blog Archive

Find Us On Facebook

FEATURED VIDEO

About us

Featured

recent posts

Tags

About Me

Labels

Biểu mẫu liên hệ

Author Social Links

Categories

Labels

Labels

Travel the world

Sponsor

Full width home advertisement

Flickr Images

Popular Posts

BTemplates.com

Blogroll

Facebook

Author Description

Advertising

About

LATEST POSTS

Post Page Advertisement [Top]

Climb the mountains

Ad Section

Popular Posts