Funding provided by the John D. and Catherine T. MacArthur Foundation

HNG DN S DNG PHN MM QGIS, EASYGT, GPSYNC

TRONG NNH VN NH V GIM ST A DNG SINH HC

H Ni, 2009

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Mc lc

1. GII THIU ..........................................................................................................................3

2. CI T QGIS V EVIS. ...................................................................................................3

2.1. Ci t OSGeo4W trn h iu hnh Windows XP ......................................................3

2.2. Ci t Easy GeoTagger v eVis ....................................................................................5

a. Ci t th vin ..............................................................................................................6

b. Ci t EasyGeotagger v eVis......................................................................................9

3. NNH VN NH.....................................................................................................................10

3.1. nh v t ng .............................................................................................................10

3.2. Cc s liu to ra trong qu trnh nh v......................................................................14

2.3. nh v nh bng bn hoc nhp ta th cng. ...................................................14

a. Nhp ta th cng ...................................................................................................15

b. Nhp ta t Google Earth .......................................................................................16

c. Nhp ta t bn trong QGIS ..............................................................................18

4. LIN KT V HIN THN NH NNH VN TRONG QGIS................................................20

5. XEM TA TRONG QGIS BNG EXIF ....................................................................23

6. THAY I THNG S NGY THNG..........................................................................23

6.1. Nu nh khng nh v c ta GPS trong GPicSync? .........................................23

6.2. Chuyn i d liu GPS sang dng GPX ....................................................................25

6.3. a ch internet cc ti liu trn: ...................................................................................25

7. BI TP ..............................................................................................................................26

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S dng phn mm m ngun m nh v nh

C nhiu phn mm m ngun m nh v nh k thut s v hin th trong phn mm QGIS. Ti liu ny gii thiu phng php nh v nh bng phn mm GPicSync, Quantum GIS, EasyGT, GPSBabel.

1. GII THIU

nh v nh l qu trnh gn ta a l (kinh ; v ) cho nh k thut s. Ta ny phc v nghin cu, lp bo co, xc nh ta v hng chp nh. nh nh v cng c th s dng trong nghin cu, gim st s thay i cnh quan, y l tnh nng tin li ca phn mm EasyGT trong cng tc bo tn a dng sinh hc v qun l ti nguyn.

C nhiu phng php nh v nh k thut s. Phng php n gin l s dng GPS-Camere chp nh (c loi ghi nhn c hng chp nh), khi thit b s t ng ghi li ta v hng chp nh. y l phng php n gin, mc t ng ha cao. Ti liu ny khng i su vo cc thut ton nh v nh.

Mt cch tip cn khc l s dng GPS ghi nhn ta song song vi thi im chp nh. Sau khi ti d liu t GPS v nh k thut s vo my tnh, s dng thi gian kt ni ta trong GPS v nh, khi phn mm s t ng kt ni ta ca GPS v nh k thut s chp cng thi gian (hoc trong khong sai lch xc nh).

S dng s liu a l nh bn , nh v tinh nh v nh k thut s trong trng hp GPS khng ghi nhn c ta , c th s dng s liu a l t bn in t trn mng nh Google Map hoc t bn s ca phNn mm GIS. Ti liu ny gii thiu s dng s liu a l t Google Map v nh v tinh trong phn mm QGIS.

N goi ra phn mm cho php nh v nh bng cch nhp ta t bn phm, tnh nng ny s dng nh v nh s trong my khi bit v tr chp nh.

2. CI T QGIS V EVIS.

2.1. Ci t OSGeo4W trn h iu hnh Windows XP

OSGeo4W l mt ng dng cho php ci t b phn mm m ngun m v Thng tin khng gian trong h iu hnh Windows XP hoc Vista, D n OSGeo4W ang c trin khai, nhng ng dng mi, chc nng mi thng xuyn c cp nht. Hy kim tra tnh trng cp nht thng xuyn.

Tham kho cc ti liu theo ng link di y bit thm chi tit.

http://www.osgeo.org/ - OSGeo4W website.

http://wiki.osgeo.org/wiki/Main_Page - OSGeo4W wiki.

http://trac.osgeo.org/osgeo4w/ - Site trao i thng tin v phn mm.

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Download v ci t Software

File ci t OSGeo4W c th download ti URL:

http://download.osgeo.org/osgeo4w/osgeo4w-setup.exe

Sau khi kch hot ng link trn my tnh s hi a ch nh file ci t. Sau khi hon thnh vic download, nhn p vo biu file OSGEO4W.exe ci t

Ca s hi thoi di hin th

Tip theo phn mm s hin th hp hi thoi. i vi ngi mi s dng hy nhn vo chn la Express Install sau nhn N ext

Sau khi nhn N ext hi hi thoi di y hin th danh sch cc phn mm m ngun m v phn tch khng gian ngi s dng chn la v ci t. Trong trng hp ny ngi s dng hy chn QGIS, GDAL v OpenEV. Sau nhn N ext bt u ci t.

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Hp hi thoi pha di ch tnh trng ci t

Ty thuc vo tc Interner v s lng phn mm la chn m thi gian ci t di hay ngn. Sau khi phn mm c ci t hon ton, ngi s dng c th khi ng phn mm theo ng link t mn hnh hoc Start -> All Programs -> OSGeo4W.

2.2. Ci t Easy GeoTagger v eVis

tng kh nng p ng nhu cu ca phn mmQGIS cho php cc ng dng m rng vi chc nng nhng plug-ins. Trung tm Cun ng thng tin a dng sinh hc, bo tng lch s t nhin Hoa K pht trin 2 ng dng nhng nhm tng kh nng nhn dng tn hiu ph ca thng tin nh v tinh v nh v nh chp. Phn mm eVis v EasyGeotagger km theo hng dn s dng v s liu v d i km.

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chy chng 2 ng dng nhng ny phn mm cn c nhng th vin libraries (libs). C 2 th vin ny c xy dng bi Phng ung ng thng tin a dng sinh hc v c ng gi teo b ci ca OSGeo4W

a. Ci t th vin

u tin hy nhn vo file ci t OSGeo4W (file ci t QGIS trc )

Sau chn Advanced Install v nhn N ext.

Hp hi thoi di y s hin ra khi ng s dng c th la chn cc phng php ci t. C th l t Internet hoc t th mc m b ci c download v cng. N u ci t Interner, ngi s dng s c c nhng modul mi nht c cp nht. N hn Install from Internet.

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Sau ngi s dng a ch dn th mc C:\OSGeo4W phn mm ci t cc th vin lu in ng. Phn mm s t ng a v th mc ci t trc . Sau nhn N ext.

Tip theo Phn mm s hi ngi s dng v th mc cha file ci t trong my tnh Local Package Directory. y l th mc m ngi s dng download b ci v my tnh. Trong lp hc ny ngi s dng c th chn /Tutorial/software/http%3a%2f%2fdownload.osgeo.org%2fosgeo4w. y l th mc cha file ci t c download v my tnh. y l th mc c to ra khi chu file ci t OSGeo4W

S dng ng n m phn mm t ng nhp v i hi thoi sau nhn N ext

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Sau phn mm s a ra cc la chn v ng truyn Internet. Chn Direct Connection sau nhn N ext.

N gi s dng s phi chn la cc th vin ( c ng gi) ci t theo hp hi thoi di y.

S hnh cy la chn Libs bng cch nhn vo nt +/- u mi tn trong hp hi thoi di y. N gi s dng chn cc th vin cn ci t vo my tnh bng cch nhn vo ch Skip u mi tn vng di y. Vi vic nhn Skip 1-2 ln chn tn hiu Instal ngi s dng c th cp nht nhng phin bn mi v th vin cn ci t.

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Hy chn cc th vin c tn di y tin hnh ci t. Ch khng thay i tnh trng ca th vin nh Uninstall

Exiv2: Image metadata library

Pyqt4: Python bindings for Qt4

Python-QGIS: Python bindings and plugins for QGIS

Python-Win32: Python for Windows Extension

Sip: Python/C++ bindings generator

Sau khi chn 5 th vin trn nhn N ext, khi phn mm s hin th tnh trng ci t cc gi th vin mi.

b. Ci t EasyGeotagger v eVis

Copy file th vin evis.dll vo th mc:

C:\OSGeo4W\apps\qgis\plugins

ci t ng dng eVis trong QGIS

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N hn vo file ci t EasyGeoTagger_0_4_0_OSGeo4W.exe. Phin bn ny EasyGeotagger s c ci t nh mt ng dng nhng trong plug-in ca QGIS.

3. NNH VN NH.

3.1. nh v t ng

thc hin chc nng ny cn phi ghi nhn ta t GPS song song vi thi im chp nh t my nh s. Khi chp nh, my nh k thut s s ghi nhn thi gian, ngy gi chp nh. GPS cng thc hin vic ghi nhn thi gian, ngy gi chp nh vo my. So snh bin thi gian lu tr trong nh v d liu a l t GPS, phn mm s t ng lin kt ta vo nh. S dng phm mm m ngun m GPicSync thc hin.

Khi ti d liu t GPS vo my tnh, ch chn v lu y cc loi d liu t GPS. Rt nhiu GPS khng nh thi gian ghi nhn ta , nu ngi dng chn nh track hoc waypoints vo GPS. Cn xem li hng dn s dng v download s liu t my GPS khi cha r cch thc, phng php v i tng s liu download.

Ch thc hnh nhun nhuyn phng php ny trc khi s dng trn thc a. Phng php s dng dng nh n gin song mc ng b s liu rt cao.

Trc khi chp nh thc a, khi ng GPS i ti khi nhn c tn hiu v chp nh mn hnh GPS ghi nhn thi gian GPS. y l bc quan trng ng b thi gian gia GPS v my nh k thut s. N hiu my nh k thut s thay i thi gian khi tho pin. Tt nht nn chnh thi gian ca my nh trc khi thao tc.

Ci t phn mm GPicSync t th mc GeoTagging/Tutorial/Software. N hn chut tri, ci t phn mm, ci t xong, chy chng trnh bng nhy p chut vo biu tng trn mn hnh hoc nhp chut vo Start=>Programs=>GPicSync=>GPicSync.

ca s GPicSync nhn vo nt Picture folder - th mc cha nh chn th mc cha nh. nh trong th mc GeoTagging/Tutorial/UntaggedImages. a thanh sng v th mc cha nh v nhn OK. Cc nh trong th mc ny s c nh v sau khi chy.

Chp nh mn hnh, ghi nhn thi gian ca my GPS ng b thi gian im ghi nhn ta t GPS v thi gian chp nh ca my nh.

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Trong ca s GPicSync nhn vo nt GPS file, ca s Select a file chn GPX hoc N IMEA, y l file cha thng tin cc im chp nh. File GPS th mc /GeoTagging/Tutorial/UntaggedImages/ 20081012.gpx.

N u GPS file nh dng khc cn chuyn i v file GPX (xem di). Phn mm m ngun m c th chuyn i cc nh dng ca file GPS l GPSBabel (www.gpsbabel.org/).

Bc tip theo, l ng b thi gian ghi nhn ca my nh v thi gian ghi nhn ca my GPS. Trong ca s GPicSync nhn vo Tools=> EXIF reader m ca s EXIF Reader - c thng tin ngun. Chn 1 trong 2 la chn v chn Date/Time/Lat./Long.

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N hn vo Select a picture Chn nh chp mn hnh c thi gian ca GPS sau nhn Open m. Chn file nh GeoTagging/Tutorial/UntaggedImages/GPS_Time.JPG.

nh chp mn hnh GPS hin th gc phi ca s GPicSync thng tin v bc nh hin th phn di ca ca s. Ch n thi gian v ngy. N gy gi chp nh l 2008:10:13:09:21:57. N gy chnh xc l ngy 13 thng 10 nm 2008 v thi gian l 9 gi, 21 57. Trong trng hp nh hin th trong ca s khng r cn hin th nh bng phn xem nh ca Windows. Sau xem thi gian hin trn mn hnh GPS t bc nh chp (s dng thi gian thc t - local time) l 17:24:23 v ngy 13 thng 10 nm 2008.

hiu chnh gi a phng v gi quc t gia My nh s v GPS nhn vo Options=>Local time correction m ca s hiu chnh gi a phng. Trong hp gi a phng hin th trong my nh s - Local time displayed now by the camera nhp thi gian my chp nh 09:21:57. Trong hp Gi a phng hin th trong GPS - Local time

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displayed now by the GPS nhp thi gian ca GPS (17:24:23). Ch thi cn c tnh theo n v 24 gi. Khng s dng n v 12 gi.

N hn xc nhn hiu chnh Apply correction, khi phn mm thng bo Thi gian c ng b: thi gian my nh = 09:21:57;thi gian GPS = 17:24:23 - A time correction has been set : Time camera= 09:21:57 Time GPS= 17:24:23. ca s GPicSync. N hn Quit ng ca s.

Bc tip theo cn nhp thng s lch thi gian gia gi a phng v gi quc t ca my GPS. Trong bi tp ny nh chp Tanzania v lch mi gi l +3. My GPS ghi nhn gi quc t, trong trng hp my GPS ci t hin th gi a phng (nh trong by tp ny) cn nhp thng s lch gi, gia gi a phng v gi quc t vo GPicSync. N u ci t thi gian ca GPS l gi quc t th khng cn nhp lch mi gi.

Hp hi thoi tip theo m t nh v nh ch c thc hin nu lch thi gian i vi im ghi nhn gn nht di (s giy). hp ny ngi s dng cn nhp thi gian sai s cho php gia thi gian chp nh v thi gian ghi nhn ta ca im gn nht. Phn mm t ng thi gian sai lch l 300 giy. Cc thng s khc gi tr mc nh. Thng tin chi tit cc thng s khc xem ti trang web. N hn ng b - Synchronize! nh v nh.

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N gi s dng c th quan st tnh trng nh v nh. Phn mm s thng bo kt qu nh v thnh cng hay khng. Sai s thi gian chp nh v thi gian ghi nhn v tr gn nht ca GPS.

3.2. Cc s liu to ra trong qu trnh nh v

N u mc nh, nhng bc nh nguyn bn s c nh vo th mc con ca th mc cha nh hin ti c tn originals-backup-GPS_Photos. nh c nh v s c ghi vo th mc nh. Th mc thumbs - hnh nh lu li cc nh kch thc nh c th hin th trn Google Earth. S dng file doc.kml trong th mc hin th ng di chuyn ca GPS v nh trn Google Earth. 1 file nht k gpicsync.log ghi li din bin ca qu trnh nh v.

Kt thc qu trnh nh v, nu my tnh c ci t phn mm Google Earth v ni mng Internet ngi s dng c th hin th nh chp ln Internet bng cch nhn vo nt View in Google Earth. Chng trnh hin th nh trong QGIS c trnh by phn sau.

2.3. nh v nh bng bn hoc nhp ta th cng.

nh v nh cn c thc hin th cng bng cch la chn im chp nh trn bn hoc nhp thng tin ta cho im chp nh. thc hin thao tc ny, s dng phn mm EasyGeoTagger (EasyGT). Phn mm c th chy trong QGIS hoc chy ng lp ring r. ci t phn mm EasyGT xem thm hng dn s dng EasyGT. Phin bn ny cho php nhp ta im chp nh t Google Earth hoc nhp ta bng tay v QGIS phin bn mi (ng ring r) cng cho php nhp ta im chp nh t nh bn vector hoc bn rastor. a ch web ca QGIS, eVis v EasyGT cui ti liu.

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Khi khi ng EasyGT ( phin bn c lp hoc phin bn m rng ca QGIS) ca s hin th c m ra.

Xem danh sch cc file trong ca s A chn nh nh v. N u nh du vo Highlight GPS EXIF Availability nhng file c thng tin nh v file nh s hin th mu xanh l cy, nhng file khng c thng tin nh v s hin th mu . Khi nh du vo highlighting ni bt, thi gian hin th mu nhanh hay chm ty thuc vo tc ca my tnh. Thng tin v nh hin th phn pha di ca danh sch file. N hn vo file bt k, nh s hin ra ca s hin th nh v c th nh v.

nh v nh bng EasyGT c hin th ca s C pha tri mn hnh. N hn vo plugin group chn plugin nh v nh v nhn vo tn ca plugin kch hot.

a. Nhp ta th cng

M EasyGT chn file theo a ch GeoTagging/Tutorial/TestImages/DSCN2801.JPG. N hn vo file hin th trong ca s nh Image Preview window. N hn vo nt EXIF Editors trong nhm plugin, tip theo nhn nt GPS EXIF Editor, phn mm s m bng GPS EXIF Editor, khi ngi s dng c th thay i cc trng thng tin bng cch nhn vo biu tng nh dng Configuration mi tn v chn trng hin th trong chnh sa trong ca s Configure. N hn vo nhm X,Y hin th kinh, v .

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N hp ta ca im chp nh vo trng Latitude v Longitude. Ta thc ca bc nh ny l V = 37.135747; Kinh = -7.336761. Thao tc xong, nhn vo N h Save nh thng tin. Khi hon thnh bc nh c nh v. kim tra kt qu nh v nh du vo Highlight GPS EXIF Availability, khi nhng nh c nh v s hin th mu xanh ni bt, nhng file khng nh v c mu ni bt l .

b. Nhp ta t Google Earth

Gi nguyn ca s GPS EXIF Editor (hoc m ca s thay i EXIF nh m t trn) sau a thanh sng n fie: GeoTagging/Tutorial/TestImages/DSCN2817.JPG. N hn vo tn file hin th trong ca s nh Image Preview. Tip theo nhn vo phn m rng Coordinate Extraction trong bng nhm cc m rng sau nhn chut vo nt Google Map. Phn mm s m ca s Google Map. N u my tnh ni mng Internet phn mm s kt ni bn Google.

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Cc nt iu kin gc phi ca s, dng iu khin v tr bn . N i dung bn c th l nh v tinh kt hp cc lp bn nh giao thng, hnh chnh. Cc nt iu kin pha tri ca s dng phng to, thu nh hoc dch chuyn bn . C th phng to 1 vng xc nh bng cch nhy p chut tri. dch chuyn bn cn nhn v gi chut tri sau di chuyn vi tr chut dch chuyn bn .

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Phng to bn ti 1 vng ca Chu Phi (khng cn v tr chnh xc). ly ta ca im chp nh, nhn chut phi vo im xc nh, khi kinh , v s xut hin pha di bn .

Khi chn c chnh xc im chp nh nhn nt N h ta - Save Coordinates pha di ca ca s bn Google Map cp nht ta vo GPS EXIF Editor. M ca s cp nht GPS EXIF m chn file nh cn nh v, kinh , v ca im chp nh hin ra trng Longitude v Latitude. N hn nht nh trong ca s GPS EXIF Editor nh ta cho nh chp.

c. Nhp ta t bn trong QGIS

nh v nh bng QGIS cn khi ng ng dng m rng EasyGT trong QGIS. ci t EasyGT v QGIS xem hng dn s dng EasyGT v QGIS

Khi ci t xong, Khi ng QGIS sau m bn bng cch Layer => Add Raster Layer and Layer => Add Vector Layer:

Raster: GeoTagging\Tutorial\TanzaniaGIS_Layers\ TZ_Satellite_UTM36.tif (chn GeoTIFF Files of type: bt ca s xem file og type).

Vector: GeoTagging\Tutorial\TanzaniaGIS_Layers\ TZ_Roads_DCW_UTM36.shp

Vector: GeoTagging\Tutorial\TanzaniaGIS_Layers\ LionLocation.shp Ch : TZ_road.e00 l lp bn ng giao thng c trch lc t b d liu Digital Chart of the World. a ch web : http://data.geocomm.com. . nh v tinh TanzaniaImage.tif c ct t c s d liu NASA Blue Marble, h ta UTM 36. c download t http://www.maplibrary.org.

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Xc nh h ta trong QGIS v kch hot h ta Decac. T Menu Settings ca QGIS chn => Project Properties. N hn bng Coordinate Reference System (CRS). nh du Enable on the fly CRS transformation. chuyn bn sang h ta Transverse Mercator (UTM) => WGS84/UTM mi 36S nhp 32736 vo hp text pha di ca s Project Properties nh du EPSG ID, nhn nt find tm h ta UTM mi 36S. Sau nhn OK xc nh h ta UTM zone 36S cho bn .

Tip theo khi ng EasyGT trong QGIS bng cch nhn vo biu tng hoc t menu Plugins=>EasyGeoTagger. Khi EasyGeoTagger khi ng nhn Auto Arrange phn mm t ng sp xp cc ca s trn mn hnh. N gi s dng c th thay i khch thc, v tr ca ca s.

Phng to hoc thu nh vo v tr S t tm im chp nh. Trong ca s EasyGT, chn file nh a ch GeoTagging/Tutorial/TestImages/DSCN2852.JPG. Hnh nh 3 con s t s hin ra trong ca s hin th nh. M ca s chnh sa GPS EXIF (GPS EXIF Editor) kch hot chc nng GPS EXIF Editor.

N hn nt Activate trong phn m rng trong ca s m rng EasyGeoTagger. Lnh ny c tc dng lin kt gia QGIS v EasyGT, khi d nu nhn chut ln ca s bn , ta hin thi ca con tr s c copy vo trng kinh v v ca EXIF Editor. N hn vo im xanh khi s 37.108 hin th trong trng kinh (Longitude) v s -7.33664

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hin th trong trng v (Latitude). N hn nh Save ca s GPS EXIF Editor khi hon tt vic xc nh ta im chp nh

4. LIN KT V HIN THN NH NNH VN TRONG QGIS

Hai phng php hin th nh nh v trong QGIS. Th nht l to file d liu CSV v s dng ng dng eVis xem v c th hin th trong phn mm GIS khc, th hai l c nhng bc nh nh v trc tip t QGIS.

To file ta t file nh c nh v: thc hin thao tc ny cn hon thnh ni dung bi tp 1. N u cha thc hin xong bi tp 1 cn chn th mc c cha cc nh nh v.

S dng EasyGT to file bng ta , ng dn nh v nhng thng tin lin quan ca file nh nh v. M Open EasyGT v chn th mc cha nh nh v. Trong bi tp ny chn th mc GeoTagging/Tutorial/UntaggedImages. Ton b nh c nh v trong th mc u c nhp thng tin vo file csv. Chn ng dng trong Utilities trong nhm ng dng m rng ca EasyGT sau nhn nt EXIF to CSV

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Phn mm s t ng to file bng (dang CSV)s liu cha cc thng tin ca file nh c lu file th mc GeoTagging/Tutorial/UntaggedImages. File CSV cha cc thng tin v ta , a ch nh, v nhng thng tin t GPS i km trong EXIF ca file. File CSV c t tn theo mu sau: Dir_Export_Date_Time.csv trong : Dir = tn ca th mc, Export = t xut khNu Export, Date = N gy to file CSV dng nm/thng/ngy, Time = thi gian to file CSV dng gi/pht/giy.

hin th file s liu trong QGIS cn khi ng phn m rng "Delimited Text Plugin". Phn m rng ny c sn khi ci t QGIS. kch hot chn Plugins=>Plugin Manger sau nh du vo Add Delimited Text Layer v nhn OK hoc t menu chn Plugins=>Delimited text=>Add Delimited Text Layer hoc nhn vo biu tng m ca s Delimited Text Layer.

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N hn vo Browse chn file CSV va to trn. ng dn v tn file c hin th dng Delimited text file N hp tn lp bn hin th trong QGIS dng Layer name. ni dung Delimiter nhp du phNy (,) v nh du vo Plain characters. Sau nhn nt Parse khai bo trng ta X v Y. Phn mm s t ng nhp s liu cho kinh - Longitude trng X v v - Latitude trngY. N hn OK, sau ca s chn ta Project Properties hin ra, ngi s dng chn h ta Geographic Coordinate Systems => WGS84 hoc nh s 4326 hp text cui ca s Project Properties v nh du vo EPSG ID sau nh nt tm find tm h ta WGS84 theo m code. N hn OK khi file CSV xut hin di dng lp bn trong QGIS. nh lp bn di dng file shape nhn chut phi vo lp thng tin sau chn Save as shapefile.

C th hin th nh trong QGIS phn m rng eVis. T menu chn Plugins=> eVis => eVis Event Browser. Khi eVis s hin th nh trong ca s hin th s kin. N u nh khng hin th c nhn Options trong ca s Generic Event Browser v hiu chnh Attribute Containing Path to File vi ng dn file nh v khng nh du vo Path Is Relative. Cc nt chc nng ca eVis hin th cc bc nh khc trong file vector va to.

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5. XEM TA TRONG QGIS BNG EXIF

Phn ny nhm b sung kin thc cho ni dung trn. N u cha thc hin bi thc hnh 1 (nh v nh) c th s dng th mc cha cc nh nh v.

M QGIS sau kch hot LoadExifDataset trong phn m rng ca QGIS bng cch nhn vo biu tng hoc t menu nhn Plugins=>LoadExifDataset. Khi ca s c EXIF xut hin.

Khi nhn vo th 1 mc hoc 1 file trong ca s LoadExifDataset ton b file trong th mc c chn. bi thc hnh ny chn th mc GeoTagging/Tutorial/UntaggedImages. N hn OK hin th cc im chp nh ( nh v) th mc chn la trong QGIS v lp thng tin s hin th trong danh sch cc lp bn . nh lp thng tin va m theo nh dng Shapefile nhn chut phi vo lp thng tin v chn "Save as shapefile...".

hin th nh trong file va to ra t LoadExifDataset bng eVis cn chn lp thng tin vector im. Kch hot eVis t menu Plugins=> eVis => eVis Event Browser. Khi ca s eVis hin th mt bc nh trong ca s Generic Event Browser. S dng mi tn tri, phi hin th cc nh khc.

6. THAY I THNG S NGY THNG

6.1. Nu nh khng nh v c ta GPS trong GPicSync?

Thi gian gia nh chp v cc im ghi nhn t GPS khng kt ni c (ln hn sai s t ra) khi chy GPicSync c mt vi nguyn nhn sau:

Th nht c th do sai thi gian chnh lch mi gi.

L do th hai c th do s khc nhau v ngy gia GPS v my nh s. Trong trng hp ny ngi s dng c th chnh sa ng b thi gian gia GPS v my nh s trong ca s

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ng b thi gian Local time corrections ca GPicSync iu chnh s khc bit. N gi s dng cng c th chnh sa thi gian t EXIF ca nh khc phc s sai lch thi gian. S dng phn mm ExifGUI thay i ngy ca cc nh chp. Hng dn di y.

thay i ngy ca mt hay nhiu nh cn download ExifTool v ExifTool GUI (xem a ch phn di). N hp p vo biu tng ExifTool GUI m ca s ExifTool Gui. S dng khung lm vic pha tri ca ca s chn th mc cha nh. Chn file nh cn thay i s dng cc phm (use ctrl-nhn chut, shift-nhn chut, hoc ctrl-a).

Chn Modify=>EXIF: DateTime shift, m ca s (EXIF) thay i ngy ca nh. Ch nh du hp DateTimeOriginal. N gi s dng c th khng nh du vo ModifyDate v CreateDate khi khng mun GpicSync s dng cc thng tin EXIF ny. Trong hp Shift amount nhp khong thi gian ngi s dng mun tnh tin. Trong ca s di y phn mm s thay i thi gian chp nh 1 nm, 2 thng v 5 ngy. N u nh du hp bn cnh thi gian s c tnh tin ln (cng vo thi gian hin ti) nu khng nh du, thi gian s tnh tin xung (tr i). N n nh du vo backup to bn copy ca cc nh trc khi thay i. N hn nt Execute tnh tin thi gian.

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6.2. Chuyn i d liu GPS sang dng GPX

Mt vn hay gp l file download t GPS bng phn mm Mapsources c lu dng mps trong khi GPicSnyc s dng file GPX hoc N IMEA v th cn chuyn i nh dng mps sang GPX. Phn mm GPSBabel c th chuyn i hu ht cc dng file ca GPS. Khi download GPSBabel, sau khi gii nn file GUI xut hin cng vi ca s lnh.

nh dng file s chuyn i input file format that you want to convert from a ch file cn chuyn i (Hin th ti file file) nh dng file cn chuyn i (trong trng hp ny chn GPX XML) a ch file s chuyn i (you can browse to the file)

N gi s dng cn nh du vo cc Waypoints, Routes, v Tracks sau nhn vo nt lets go chuyn i nh dng ca GPS.

6.3. a ch internet cc ti liu trn:

GPicSync c th download ti: http://code.google.com/p/gpicsync/

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EasyGeoTagger c th download ti: http://biodiversityinformatics.amnh.org/open_source/easygeotagger/index.php

QGIS c th download ti http://qgis.org/ (use the OSGEO4W installer: http://trac.osgeo.org/osgeo4w/)

eVis plugin for QGIS c th download ti: http://biodiversityinformatics.amnh.org/open_source/evis/

GPSBabel c th download ti http://www.gpsbabel.org/ ExifTool c th download ti http://www.sno.phy.queensu.ca/~phil/exiftool/ ExifTool GUI c th download ti

http://freeweb.siol.net/hrastni3/foto/exif/exiftoolgui.htm Ch khi ci t: Unzip gii nn ExifToolGUI v ExifTool vo th mc bt k. C th s dng a Desktop shortcut ti ExifToolGUI. Ch : Sau khi unzipping ExifTool, cn thay i tn "exiftool(-k).exe" thnh "exiftool.exe".

7. BI TP

1. nh v nh t ng

2. nh v nh th cng bng cch nhp ta

3. nh v nh t Google Earth

4. nh v nh t bn

5. Tnh tin ngy thng chp nh