Bi thc hnh:ng dng Gis trong qun l mi trngBi 1:Phn tch mng Network Analysis (ng dng cho mng li thu gom rc trong trng i hc Lt)

Phng phpXy dng cu trc mng:Xy dng cc trng d liu F_node, T_node, name v length cho lp d liu ng giao thng.Xy dng lp d liu v tr cc thng rc dc cc tuyn ng v v tr cc ging ngChy th mng Xc nh li cu trc mngThc hin cc php phn tch:Find Best Route: Tm l trnh tt nhtFind Closest Facility: Tm v tr thun li nht

Ghi chKhi s ha, cc tuyn ng giao nhau phi ct nhau, khng c bng ngang nhau.Phi tnh chiu di (v thi gian) cho tng on ng V tr cc thng rc v cc ging ng phi nm trn ng giao thng, khng c nm cch xa ng.

Bi thc hnh:ng dng Gis trong qun l mi trngBi 2:LA CHN V TR THCH HP XY DNG BI CHN LP

Phng php:S dng cng c Geoprocessing Wizard:Dissolve features based on an attribute

Chc nng: Tp hp cc i tng c gi tr thuc tnh ging nhau Input: lp d liu cha cc i tng cn tp hp Out put: Lp d liu kt quMerge themes together Chc nng: gn kt cc i tng ca hai hoc nhiu lp d liu vo 1 lp d liu. Cc thuc tnh s c gi li nu chng c tn ging nhau Input: Cc lp d liu cn ghp Output: lp d liu kt qu

Clip one theme based on another: Chc nng: ct mt lp d liu bng mt lp d liu khc. Kt qu to mt lp d liu mi c hnh dng ca lp d liu dng ct v thuc tnh ca lp d liu b ct. Input: Lp d liu b ct Clip theme: Lp d liu dng ct Result Theme: Lp d liu b ct c hnh dng ca lp d liu dng ct v thuc tnh ca lp b ctIntersect two themes Chc nng: Ct mt lp d liu bng mt lp d liu khc. Kt qu to mt lp d liu mi c hnh dng ca lp d liu dng ct v thuc tnh ca c 2 lp d liu. Php ct ny ch ly phn chung gia 2 lp d liu. Input: lp d liu b ct Overlay: lp d liu dng ct Output: lp d liu kt qu c hnh dng ca lp d liu dng ct v thuc tnh ca c 2 lp d liu

Union two themes

Assign data by location (Spatial Join)

Chc nng: ct 1 lp d liu bng mt lp d liu khc. Kt qu to mt lp d liu mi c hnh dng v thuc tnh ca c 2 lp d liu. Input: Lp d liu b ct Overlay: Lp d liu dng ct Output: Lp d liu kt qu c hnh dng v thuc tnh ca c 2 lp d liu Chc nng: kt hp bng thuc tnh ca lp d liu 2 vo bng thuc tnh ca lp d liu 1 khi 2 lp d liu ny c chung v tr.

CC BC THC HINXc nh cc yu cu ca bi ton: Nn a cht n nh, khng c t gy, khng sp ln (Lp d liu a cht) Nn t khng thm nc (Lp d liu v t) Khng c mch nc ngm (Lp d liu a cht) Xa khu dn c (Lp d liu dn c) Qun l theo a gii hnh chnh (Lp d liu ranh gii hnh chnh) u tin s dng t trng, i trc, t cha s dng (Lp d liu hin trng s dng t) La chn php phn tch ph hp (Clip, Intersect hoc Union) c kt qu l mt lp d liu c y thng tin ca tt c cc lp d liu lin quanThc hin truy vn (Query) tm v tr tha mn iu kin (1)

Thc hin phn tch Union gia lp hanhchinh_dalat v diachat_dalat. t tn cho lp d liu kt qu l diachat_hanhchinh. Lp d liu ny c thng tin v a cht ca mi vng hnh chnh.Thc hin phn tch Union gia lp diachat_hanhchinh v bando_dat. t tn cho d liu kt qu l dc_hc_dat. Lp d liu ny c thng tin hnh chnh, a cht v lp t nn.Thc hin truy vn trn lp hientrang_sudungdat, tm nhng vng t trng, cha s dng. Tch cc vng ny thnh 1 lp ring bit (s dng chc nng Convert to shapefile trong menu Theme) v t tn l datchua_sudungThc hin phn tch Union gia dc_hc_dat v datchua_sudung. t tn cho d liu kt qu l dc_hc_dat_dattrong. Lp d liu ny c thm thng tin v cc vng t cha s dngTo vng m bn knh 5km cho lp d liu dn c, t tn l xadancu_5kmThc hin Union gia lp dc_hc_dat_dattrong v xadancu_5km. t tn file l ketquaThc hin Query trn lp ketqua, tm vng t tha mn iu kin: khng c tng cha nc, khng c khe nt v l hng, t cha s dng, lp t nn c cha thnh phn st cao v cch khu dn c 5km.

Query=(Khng khe nut, khng lo hong)+(Set > 50%)+(khng chua nuoc)+(buffer =0)+(dat doi nui_chua su dung)

( not (([Dangtontai] = "khe nut") or ([Dangtontai] = "lo hong")) and ([Zset_20cm] > 30) and ([Tcn] = "khong chua nuoc") and ([Bufferdis] = 0) and ([Loai_dat] = "Dat doi nui chua su dung))

( not (([Dangtontai] = "khe nut") or ([Dangtontai] = "lo hong")) and ([Tp_cogioi1] = "thit pha trung binh va set") and ([Tcn] = "khong chua nuoc") and ([Bufferdis] = 0) and ([Loai_dat] = "Dat doi nui chua su dung))

Bi thc hnh:ng dng Gis trong qun l mi trngBi 3:LP BN CH S THC VT NDVI DA TRN NH VIN THM

S dng nh vin thm ETM+ ca DalatS dng chc nng phn tch Vegetative Index trong menu Image Analysis lp bn Thc hin phn loi nh Categorize lp bn chuyn v cc dng thm thc vt ti Dalat

Bi thc hnh:ng dng Gis trong qun l mi trngBi 4:NI SUY D LIU V LP BN A HNH

LP BN NI SUY BI