S DNG CHNG TRNH PHN MM VERTICAL MAPER TO FILE DC Phn mm Vertical Maper c vit ra thc hin cc nhim v nghin cu thnh lp cc m hnh s a hnh v cc nhim v khc c lin quan. thc hin vic thnh lp mt m hnh dc trong mi trng Vertical Maper, ta ln lt thc hin cc nhim v sau: 1- Bc I: Chun b mt bn a hnh + Gn d liu cao a hnh cho cc ng ng cao. + Sao lu kt qa. (Hnh 1). Nhng ng ng cao ny c kt ni vi d liu cao.

2- Bc II: Chuyn cc ng ng cao thnh cc chui im cao. + M file "DangCao" + T thanh menu, chn "Vertical Maper" chn dng lnh "Creade Grid" chn dng lnh: "Poly2Point". My tnh s thc hin php chuyn i t ng (Polylines) thnh chui cc im (points). Trong qu trnh my tnh thc hin php chuyn i, trn mn hnh xut hin mt th th hin tin trnh thc hin php tnh chuyn i theo % cng vic thc hin c. Thi gian thc hin di hay ngn ph thuc vo ln ca file "DangCao" (Hnh 2). + Sao lu file *.PTP.

Hnh II.4: Bn ng ng cao sau khi VM ni suy, to thnh chui im. Kt qu ca bc II l my tnh to ra mt file mi c phn m rng l *.PTP. 3- Bc III: Thc hin php ni suy to ra m hnh s cao a hnh. + M file "Dangcao.PTP"

+ Chn menu "Vertical Maper". Trong bng menu bung xung, chn "Create Grid" > Trong bng menu mi bung xung, chn dng lnh "Interpolation" > xut hin ca s "Select Interpolation Method" (III.2). Trong ca s ny cha 4 phng php:

Trong trng hp ny, ta chn phng php th 1(Ni suy tam gic): "Triangulation with Smoothing" Interpolation". > Chn "Next" > Xut hin ca s mi: "Select Table and Column..." Trong ca s Select Table and Column c cc hp thoi: - Select Table to Grid: ta chuyn vch sng xung file "DangCao.PTP."

- Select Column: chn file c tn mc nh l: Elev hoc ID(trng m ta gn gi tr cao Bc 1) - Enter Data Description: Trong hp thoi EDD ta in "DoCao", hoc mt tn no ph hp vi thuc tnh ca i tng. -Unit Type: Click con tr chut vo mi tn bn phi chn n v o. Trong trng hp v d ny, ta chn "Meter" Chn "Next" > Mt ca s "Vertical Maper" xut hin vi th "Read Points"- th hin qu trnh Vertical Maper c ga tr cc im. > Xut hin ca s: "Triangulation with SmoothingInterpolation", Chn "Next" Cc thao tc tip theo c thc hin theo th t cc nh: - Vertical Mapper c gi tr cc im trong qu trnh ni suy.

- VM ni suy TIN > Chn "Next"

- VM ni suy TIN to m hnh s > Chn "Next"

- Chn "Finish"

- th tin trnh ni suy TIN to m hnh s cao a hnh

- Kt qu ni suy - M hnh s cao a hnh.

TIP THEO: Trn thanh cng c ca Vertical Maper, chn biu tng "Show GridManager", ca s sau s hin th:

- Trn ca s Grid Manager chn cng c "Analysis", chn Create Slope & Aspect.

- Trong ca s Slope and Aspect ta tt chn Create aspect grid > ok

- Kt qu ta c file id_Slope.grd nh sau :

- Trn ca s Grid Manager ta chuyn vch sng xung file " id_Slope.grd", chn cng c "Contour"

- Trong hp thoi Contour:

+ Tuy theo yu cu Contour v dc ta gn gi tr. y ta chn Contour vi khong cch 5m. + Insert : thm hng + Delete : xa hng +Ta c th thay i mu cho tng Contour Sau khi hon tt cc thao tc ta chn OK

- Kt qu ta c file id_Slope_contour.tab nh sau :