Mount Vernon Charles Station Potential Visibility Assessment. December 4, 2017 Chesapeake Conservancy Annapolis, MD 21401

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Wesley Carr
5 years ago
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1 Mt Vr Charls tati Pttial Vility Assssmt Dcmbr, 7 Chsapak Csrvacy Aaplis, MD

2 Mthdlgy Bst Availabl Data Lidar pit clds rprst th bst availabl lvati data i Charls ad Pric Grg s Ctis. Ths datasts ctai millis f pits that icld a latitd, lgitd, ad lvati ad ca b prcssd it a mbr f high-rslti, high-accracy drivativ datasts, icldig a bar-arth digital lvati mdl (DM), rprstig th lvati with all atral ad athrpgic fatrs rmvd, ad a first-rtr digital srfac mdl (DM), rprstig th tps f trs ad bildigs as wll as p grd. Th ara ard th prpsd prjct has lidar data availabl that was cllctd i witr. Lidar data taks it acct small chags i tpgraphy, as wll as atral ad ma-mad fatrs, which ca hav dramatic impacts vility. Additially, bcas this data was flw i witr, it prvids a laf-ff datast, which will shw a mr csrvativ tr capy ad cld b csidrd maximm vility cditis. Whil it is likly that thr will b cditis icrasig th vility f th prpsd strctr, vility ca b xpctd t b rdcd drig thr sass whr tr capy plays a largr rl i scrig th prpsd cmprssr stati frm Mt Vr. Usig this lvati data allws fr th crati f m rslti datasts that rflct th actal hights f trs ad bildigs, as ppsd t stimatd hights, prvidig a mr rprstativ lvati mdl. Tchical Mthdlgy I prparati fr th aalysis, tw layrs wr cratd frm th lidar lvati data, a digital lvati mdl (DM), rprstig bar-arth cditis, ad a digital srfac mdl (DM), rprstig th maximm lvati f fatrs th grd, sig sri s ArcGI swar. DM - T crat th DM, a classifid Lidar pit cld was filtrd t ly icld grd pits, which xclds all pits classifid as vgtati, bildigs, watr, bridg dcks, r pwr lis as wll as classifid pits. Th rmaiig pits wr cvrtd it a -mtr rslti rastr lvati srfac with th lvati drivd frm th ma val f all Lidar pits withi ach pixl. DM T crat th DM, all pits i th Lidar pit cld wr sd t crat a - mtr rslti rastr lvati srfac. lvati vals wr drivd frm th maximm lvati val i ach pixl. Th vility f th prpsd cmprssr stati was assssd sig sri s Vility tl lvragig th DM srfac with a bsrvr lcatis st t a sris f twty-tw pits th prprty f Mt Vr, with a lvati st at abv grd lvl. lvatis withi th parcls wd by Dmii aticipatd t b clard wr st t th DM t mdl th vgtati clarig that wld ccr drig cstrcti (Figr ). Th cmprssr stati s lcati ad ara t b clard wr had digitizd basd a cpy f th sit pla, which was grfrcd t th lcati ad matchd t twlv pits thrght th map ara.

Figr : Prpsd Bildig it lcati, icldig th apprximat sit dsig f th cmprssr stati Aras whr a tall idividal wld hav a bstrctd viw t th parcls ctaiig th cmprssr stati wr slctd by idtifyig aras that ar

3 Figr : Prpsd Bildig it lcati, icldig th apprximat sit dsig f th cmprssr stati Aras whr a tall idividal wld hav a bstrctd viw t th parcls ctaiig th cmprssr stati wr slctd by idtifyig aras that ar csidrd vl i th aalysis. T assss th pttial vility f a strctr, th diffrc btw th sm f th DM ad abv grd layr (AGL), a tpt f th vility aalysis idicatig th additial hight that wld b rqird fr a srfac t b vl, ad th bar-arth DM was calclatd. This rprsts th hight a bildig wld hav t b t b csidrd vl frm Mt Vr. This aalysis was cmpltd bth a DM ad DM srfac t drstad diffrcs i vility basd tr scrig vrss tpgraphic scrig. Csidratis ad Limitatis O f th largst csidratis that mst b tak it acct is that th lidar data was cllctd i ad thr is th pttial fr trs t hav grw r b ct dw, ad sm ladscaps may hav b clard ad dvlpd. All f ths vts cld hav a impact th vility f th prpsd stati ad this aalysis shld b csidrd a bst rprstati f aticipatd impacts.

Fidigs It was dtrmid that clarig th bildig sit ad cstrcti f th prpsd strctr wld t rslt i dirct vility f th cmprssr stati frm ay f th viwr lcatis at Mt Vr (Figr ad

Additially, it is likly that clarig th bildig sit itslf wld impact th viwshd frm Mt Vr d t th drlyig tpgraphy btw th bildig sit ad Mt Vr as wll as th prtctd stats f mch

4 Fidigs It was dtrmid that clarig th bildig sit ad cstrcti f th prpsd strctr wld t rslt i dirct vility f th cmprssr stati frm ay f th viwr lcatis at Mt Vr (Figr ad Attachmt A). Additially, it is likly that clarig th bildig sit itslf wld impact th viwshd frm Mt Vr d t th drlyig tpgraphy btw th bildig sit ad Mt Vr as wll as th prtctd stats f mch f th ladscap btw Mt Vr ad th prpsd sit (Attachmt B). Figr : Vility f th prpsd sit frm Mt Vr sig a DM srfac Th prpsd cstrcti sit is lcatd bhid a larg blff that wld bscr a 7-8 tall bildig v if all f th trs th ladscap wr rmvd. (Figr 3 ad Attachmt C). Figr 3: Bildig hight that wld b dd t b vl basd a DM vility aalysis ( trs th ladscap)

5 With th xistig tr capy, a strctr wld d t b vr tall t b vl aywhr i th ara that has b prpsd t b clard ad vr tall at th prpsd cstrcti sit (Figr ad Attachmt D). Csqtly, th rmval f trs withi th prpsd ara t b clard r th cstrcti f th cmprssr stati will likly t rslt i ay chag i th viwshd frm Mt Vr. Figr : Bildig hight that wld b dd t b vl basd a DM vility aalysis (trs ad xistig strctrs tak it acct) Hwvr, it shld b td that th parcls t th wst f th primary parcl ar t scrd by th blff ad ar vl i th crrt cditis ad ay cstrcti ths sits wld hav a highr liklihd f big vl. Additially, smk, stam, r atral gas flars might b vl dpdig thir hight ad pratig cditis at th cmprssr stati.

6 x isti gc d iti sv ility N tv l Attachmt A V l M tv r V i w rp i ts. M il s G y,m icr s, C N /A irb sd

7 Attachmt B l va ti ( ) l va ti fr m M tv r tp r p s dc m p r ss rta ti, 8, D ista c( ), 6,

8 H ig h tr q ir dtb V l (b a s d D M ) < Attachmt C > M il s G y,m icr s, C N /A irb sd

9 H ig h tr q ir dtb V l (b a s d D M ) < Attachmt D > M il s G y,m icr s, C N /A irb sd

European Business Confidence Survey December 2012 Positive expectations for 2013

European Business Confidence Survey December 2012 Positive expectations for 2013 Dcmbr 2012 Erpa Bsiss Cfic rv Dcmbr 2012 Psitiv xpctatis fr 2013 Lasrp a Ivigrs EMEA hav rctl cmplt thir latst Erpa Bsiss Cfic rv. Th fiigs sggst a psitiv start t 2013 a a mr ptimistic tlk cmpar t that